今天，我们在托管一个非常繁忙的网站的服务器上安装了 SSL 证书（来自 letsencrypt）。
几个小时后，我们注意到一些用户收到了来自 nginx 的错误：
2018/03/28 13:04:48 [crit] 8997#8997: *604175694 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 2.178.99.86, server: 0.0.0.0:443
2018/03/28 13:06:03 [crit] 9937#9937: *604177779 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 5.73.106.149, server: 0.0.0.0:443
2018/03/28 13:06:46 [crit] 9949#9949: *604179134 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 192.15.212.150, server: 0.0.0.0:443
2018/03/28 13:10:33 [crit] 9942#9942: *604185439 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 5.234.36.205, server: 0.0.0.0:443
从 IP 地址来看，用户可能使用手机浏览，但我不知道他们的浏览器。我已将 nginx 错误日志记录更改为调试模式，以下是部分输出：
Server: nginx^M
Date: Wed, 28 Mar 2018 13:37:19 GMT^M
Content-Type: text/html; charset=UTF-8^M
Transfer-Encoding: chunked^M
Connection: keep-alive^M
Set-Cookie: PHPSESSID=r3mo9gh549obv41nkrf747l017; path=/^M
Expires: Thu, 19 Nov 1981 08:52:00 GMT^M
Cache-Control: no-store, no-cache, must-revalidate^M
Pragma: no-cache^M
Location: *******************************
X-Cache: MISS^M
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 write new buf t:1 f:0 00007F06A5884708, pos 00007F06A5884708, size: 601 file: 0, size: 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http write filter: l:0 f:0 s:601
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http script var: "0"
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http file cache set header
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http cacheable: 1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http upstream process upstream
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe read upstream: 1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe preread: 23
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 readv: 1, last:261440
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe recv chain: 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe buf free s:0 t:1 f:0 00007F06A56D0B50, pos 00007F06A56D0DF9, size: 23 file: 0, size: 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe length: -1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 01
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 03
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 00
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 01
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 00
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 08
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 00
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record byte: 00
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi record length: 8
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http fastcgi sent end request
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe write chain
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 add cleanup: 00007F06A5884B20
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 hashed path: /var/lib/nginx/fastcgi/7/54/0423471547
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 temp fd:129
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 write: 129, 00007F06A56D0B50, 681, 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe write downstream: 1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 pipe write downstream done
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 event timer: 80, old: 1522244549474, new: 1522244549680
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http file cache update
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http file cache rename: "/var/lib/nginx/fastcgi/7/54/0423471547" to "/run/shm/nginx/f/d9/b295394f65a2a43ae0ec0adadd243d9f"
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 malloc: 00007F06A5677B30:64
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 malloc: 00007F06A588F5E0:681
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http upstream exit: 0000000000000000
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 finalize http upstream request: 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 finalize http fastcgi request
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free rr peer 1 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 close http upstream connection: 80
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A55C40A0, unused: 48
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 event timer del: 80: 1522244549474
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 reusable connection: 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http upstream temp fd: 129
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http output filter "/index.php?p=1187697"
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http copy filter: "/index.php?p=1187697"
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 SSL_do_handshake: 1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http postpone filter "/index.php?p=1187697" 00007FFD85DA3BF0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http chunk: 0
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 SSL: TLSv1.1, cipher: "ECDHE-RSA-AES128-SHA TLSv1 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA1"
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 write old buf t:1 f:0 00007F06A5884708, pos 00007F06A5884708, size: 601 file: 0, size: 0
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 reusable connection: 1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 write new buf t:0 f:0 0000000000000000, pos 00007F06A3953C9B, size: 5 file: 0, size: 0
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 http wait request handler
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http write filter: l:1 f:0 s:606
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 malloc: 00007F06A5668370:1024
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http write filter limit 0
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 SSL_read: -1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 malloc: 00007F06A5722010:16384
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 SSL_get_error: 2
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 SSL buf copy: 601
2018/03/28 18:07:19 [debug] 24364#24364: *604587625 free: 00007F06A5668370
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 SSL buf copy: 5
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 SSL handshake handler: 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 SSL to write: 606
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 SSL_write: 606
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http write filter 0000000000000000
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http copy filter: 0 "/index.php?p=1187697"
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http finalize request: 0, "/index.php?p=1187697" a:1, c:1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 set http keepalive handler
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http close request
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 http log handler
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 posix_memalign: 00007F06A56C79D0:4096 @16
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 run cleanup: 00007F06A5884B20
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 file cleanup: fd:129
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 run cleanup: 00007F06A579A998
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 run cleanup: 00007F06A579A098
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 close cached open file: *******************************
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 expire cached open file: *******************************
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 expire cached open file: *******************************
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 run cleanup: 00007F06A5799E90
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 close cached open file: *******************************
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 expire cached open file: *******************************
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 expire cached open file: *******************************
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 close cached open file: *******************************
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A56D0B50
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A5846DC0, unused: 1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A57999C0, unused: 2
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A5883DB0, unused: 61
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A56C79D0, unused: 3689
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A571F240
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 hc free: 0000000000000000 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 hc busy: 0000000000000000 0
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 free: 00007F06A5722010
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 reusable connection: 1
2018/03/28 18:07:19 [debug] 24356#24356: *604585753 event timer add: 36: 310000:1522244549680
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 SSL_do_handshake: 1
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 SSL: TLSv1.1, cipher: "ECDHE-RSA-AES128-SHA TLSv1 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA1"
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 reusable connection: 1
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 http wait request handler
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 malloc: 00007F06A5668480:1024
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 SSL_read: -1
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 SSL_get_error: 2
2018/03/28 18:07:19 [debug] 24364#24364: *604587624 free: 00007F06A5668480
2018/03/28 18:07:19 [debug] 24360#24360: post event 00007F069F820070
2018/03/28 18:07:19 [debug] 24360#24360: delete posted event 00007F069F820070
2018/03/28 18:07:19 [debug] 24360#24360: accept on 0.0.0.0:443, ready: 1
2018/03/28 18:07:19 [debug] 24360#24360: posix_memalign: 00007F06A5621B50:512 @16
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 accept: 5.213.82.78:10738 fd:53
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 event timer add: 53: 10000:1522244249682
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 reusable connection: 1
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 epoll add event: fd:53 op:1 ev:80002001
2018/03/28 18:07:19 [debug] 24360#24360: accept() not ready (11: Resource temporarily unavailable)
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 post event 00007F069F820A90
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 delete posted event 00007F069F820A90
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 http check ssl handshake
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 http recv(): 1
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 https ssl handshake: 0x16
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 SSL_do_handshake: -1
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 SSL_get_error: 1
2018/03/28 18:07:19 [crit] 24360#24360: *604587635 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 5.213.82.78, server: 0.0.0.0:443
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 close http connection: 53
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 event timer del: 53: 1522244249682
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 reusable connection: 0
2018/03/28 18:07:19 [debug] 24360#24360: *604587635 free: 00007F06A5621B50, unused: 152
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 SSL handshake handler: 0
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 SSL_do_handshake: 1
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 SSL: TLSv1.1, cipher: "ECDHE-RSA-AES128-SHA TLSv1 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA1"
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 reusable connection: 1
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 http wait request handler
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 malloc: 00007F06A56A0050:1024
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 SSL_read: -1
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 SSL_get_error: 2
2018/03/28 18:07:19 [debug] 24364#24364: *604587627 free: 00007F06A56A0050
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 SSL handshake handler: 0
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 SSL_do_handshake: 1
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 SSL: TLSv1.1, cipher: "ECDHE-RSA-AES128-SHA TLSv1 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA1"
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 reusable connection: 1
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 http wait request handler
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 malloc: 00007F06A56A0130:1024
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 SSL_read: -1
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 SSL_get_error: 2
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 free: 00007F06A56A0130
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http wait request handler
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 malloc: 00007F06A56A0130:1024
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 SSL_read: -1
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 SSL_get_error: 2
2018/03/28 18:07:19 [debug] 24364#24364: *604587626 free: 00007F06A56A0130
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http wait request handler
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 malloc: 00007F06A56A0130:1024
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 SSL_read: 823
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 SSL_read: -1
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 SSL_get_error: 2
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 reusable connection: 0
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 posix_memalign: 00007F06A568CAC0:4096 @16
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http process request line
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http request line: "GET /?p=1246163 HTTP/1.1"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http uri: "/"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http args: "p=1246163"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http exten: ""
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 posix_memalign: 00007F06A5677680:4096 @16
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http process request header line
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http header: "Host: www.e-estekhdam.com"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http header: "Connection: keep-alive"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http header: "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http header: "User-Agent: Mozilla/5.0 (Linux; Android 4.2.2; C2305 Build/16.0.B.2.16) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.94 Mobile Safari/537.36"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http header: "Accept-Encoding: gzip,deflate,sdch"
2018/03/28 18:07:19 [debug] 24364#24364: *604587623 http header: "Accept-Language: fa,en-US;q=0.8,en;q=0.6"
这是一个旧的安卓手机浏览器或者旧的安卓手机的 webview。
我希望能够支持这些类型的浏览器，因此我决定添加对 TLSv1 和 SSLv2 和 SSLv3 的支持，因此我将其添加到我的 nginx 配置文件中：
ssl_protocols SSLv2 SSLv3 TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
然而根据我所做的检查，我的服务器尚不支持 SSLv3（是的，我知道 POODLE），并且根据 nginx 错误日志，仍然有许多用户收到握手错误。
问题是我应该怎么做才能支持这些类型的浏览器？
答案1
别理他们
从短时间内对我的网站进行的连接尝试次数来看，这些显然是试图破坏服务器的安全。不要降低您的安全设置，让这些家伙得逞。这是 2 秒内来自同一 IP 地址的 93 个请求。
2018/06/11 04:22:00 [crit] 972#972: *315608 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315616 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315643 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315645 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315650 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315652 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315663 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315674 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315675 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 971#971: *315677 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315680 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315685 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315691 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315703 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315712 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315719 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315720 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315734 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315737 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315738 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315766 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315767 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315770 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315771 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315776 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315778 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315782 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315786 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315787 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315789 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315790 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315793 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:00 [crit] 972#972: *315797 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315803 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315807 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315809 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315813 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315818 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315823 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315829 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315831 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 971#971: *315835 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315837 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315839 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315840 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315841 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315843 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315844 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315845 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315846 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315847 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315848 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315849 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315850 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315853 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315856 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315858 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315859 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315860 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315861 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315863 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315862 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315864 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315866 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315867 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315868 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315870 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315871 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315872 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315873 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315874 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315875 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315876 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315877 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315878 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315879 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315880 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315881 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315882 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315883 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315887 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315888 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315889 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315890 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315893 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315896 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315897 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315898 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315899 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315900 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315902 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315903 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
2018/06/11 04:22:01 [crit] 972#972: *315904 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 172.104.154.126, server: 0.0.0.0:443
答案2
我很确定routines:tls_process_client_hello:version too low表示客户端无法使用系统上配置的密码进行连接。此外，如果浏览器不信任 Let's Encrypt Root CA，则连接将失败。
我不同意降低网站的安全性，以便允许一些使用旧硬件的客户端连接，而这些硬件早就应该升级了。你实际上是在为少数客户端牺牲安全性。
这些甚至不是真正的客户端，这也并非不可能。这些可能是恶意“客户端”，试图强制降级连接，以开始破坏您的安全性，窃取信息、私钥等……
答案3
我完全支持 Andrew 的说法，几乎没有人提供对 SSLv2/3 或没有 SNI 的客户端的支持。但如果您仍然愿意，冒着暴露所有其他用户数据的风险，请在此处进行 SSL 测试https://www.ssllabs.com/ssltest/并调整您的密码，直到与所有列出的浏览器兼容。忽略 Android 2.x 和 Java 1.6.x，如果没有无限的 IPv4 地址供应，您将永远无法降低安全性，如果您打算这样做，最好完全禁用 HTTPS，这样至少您的用户不会被连接安全的假设所欺骗。
答案4
在 ubuntu 18.04 和 nginx 1.14+ 上...正如 @Daniel 上面所述，“我完全支持 Andrew 的说法”，即“几乎没有人为 SSLv2/3 或没有 SNI 的客户端提供支持”。
如果存在遗留系统，那么在我看来这就是防火墙问题。
真正让我们感到困惑的是创建了遗留代码，例如包含/etc/nginx/custom-name-here/或/etc/nginx/conf.d/文件夹包含，并将它们添加到和中/etc/nginx/nginx.conf。sites-enabled/example-org随后的升级导致了错误，如下图所示nginx -t
我不确定我是否表达得很清楚，但在 14.04 和 16.04 上，有一段时间我们必须手动指定密码。较新版本的 NGINX 上的默认设置导致冗余，因此引发错误。18.04 上的新 nginx 密码默认值（包括 certbot/letsencrypt）更加安全……但它们确实要求我们删除自定义证书限制。
如果这仍然是一个问题，我建议您删除（先谷歌一下！）letsencrypt 并重新安装 certbot。https://certbot.eff.org/并利用该/etc/nginx/snippets/文件夹包含您 sites-available /slash/ sites-enabled 文件夹中的内容。