我无法使用 ssh 连接到服务器。上周一切正常，现在 ssh 服务器只接受密码验证，不允许使用公钥。
带有 sshd 的服务器是 Debian 9，客户端是 LinuxMint。我有另一台服务器，其配置与出现错误的服务器相同，在这台服务器上，我可以使用公钥通过 ssh 进行连接。
因此我检查服务器和 LinuxMint 上的文件权限。
服务器权限：
drwx------ 2 plop plop 4,0K mai 24 12:10 .ssh
-rw------- 1 plop plop 750 mai 24 12:10 authorized_keys
我检查了/etc/ssh/sshd_config如果可以使用公钥。
我创建了一个新的 rsa 4096b ssh 密钥，并使用 ssh-copy-id 复制到服务器。
我创建了一个新用户并添加了 ssh 公钥。
我卸载并重新安装了openssh-服务器。
我重启了服务器和客户端。
什么都不起作用。每次我尝试连接时，ssh 客户端都会提示我输入密码（太疯狂了）。
以下是 ssh 尝试连接的日志：
debug1: Reading configuration data /home/userami/.ssh/config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "10.10.10.02" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 10.10.10.02 [10.10.10.02] port 22.
debug1: Connection established.
debug1: identity file /home/userami/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/userami/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/userami/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/userami/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/userami/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/userami/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/userami/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/userami/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Debian-10+deb9u6
debug1: match: OpenSSH_7.4p1 Debian-10+deb9u6 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 10.10.10.02:22 as 'remoteusername'
debug3: hostkeys_foreach: reading file "/home/userami/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/userami/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from 10.10.10.02
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: [email protected]
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:IW89ksNoqRYQMGDan+XXXXXXXXXXXXXXXXXXXXXXXXXX
debug3: hostkeys_foreach: reading file "/home/userami/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/userami/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from 10.10.10.02
debug1: Host '10.10.10.02' is known and matches the ECDSA host key.
debug1: Found key in /home/userami/.ssh/known_hosts:2
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /home/userami/.ssh/id_rsa (0x55a67a2bff40), agent
debug2: key: /home/userami/.ssh/id_dsa ((nil))
debug2: key: /home/userami/.ssh/id_ecdsa ((nil))
debug2: key: /home/userami/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: password
debug3: start over, passed a different list password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup password
debug3: remaining preferred: ,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
[email protected]'s password:
我尝试使用调试日志启动 ssh 守护进程/usr/sbin/sshd -d -p 2222，并且在 2222 端口上 ssh 服务器接受我的公钥（为什么？？）。
因此，我更改了 sshd_config 中的端口号并重新启动了服务，现在我可以使用公钥连接端口 2222。但如果我改回 22，连接将不起作用并要求输入密码。
为什么 ssh 服务器在 2222 端口接受公钥但不接受默认端口？
-- 编辑 1 --
按照 Martin @Dmitriy Kupch 的要求
ss -tulpn | grep 22
tcp LISTEN 0 128 *:2222 *:* users:(("sshd",pid=7805,fd=3))
tcp LISTEN 0 128 :::2222 :::* users:(("sshd",pid=7805,fd=4))
这lsof-i:22沒有返回任何东西。