我正在尝试在我的服务器上设置 pptp VPN，但由于某些原因，服务器没有响应我。
在服务器上我有：
$ sudo netstat -alpn | grep :1723
tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN 9636/pptpd
我正在使用 UFW 作为防火墙：
$ sudo ufw status
Status: active
To Action From
-- ------ ----
1723 ALLOW Anywhere
22 ALLOW Anywhere
80 ALLOW Anywhere
443 ALLOW Anywhere
1723 (v6) ALLOW Anywhere (v6)
22 (v6) ALLOW Anywhere (v6)
80 (v6) ALLOW Anywhere (v6)
443 (v6) ALLOW Anywhere (v6)
还 ：
$ grep -v "#" /etc/pptpd.conf
option /etc/ppp/pptpd-options
logwtmp
localip 10.0.0.1
remoteip 10.0.0.10-100
$ grep -v "#" /etc/ppp/pptpd-options
name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe-128
ms-dns 208.67.222.222
ms-dns 208.67.220.220
proxyarp
nodefaultroute
lock
nobsdcomp
novj
novjccomp
nologfd
和 ：
$ sudo grep -v "#" /etc/ufw/before.rules
*nat
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -s 10.0.0.0/24 -o eth0 -j MASQUERADE
COMMIT
*filter
:ufw-before-input - [0:0]
:ufw-before-output - [0:0]
:ufw-before-forward - [0:0]
:ufw-not-local - [0:0]
-A ufw-before-input -p 47 -j ACCEPT
-A ufw-before-output -p 47 -j ACCEPT
-A ufw-before-input -p tcp -s 0.0.0.0/0 --sport 1723 -j ACCEPT
-A ufw-before-output -p tcp -d 0.0.0.0/0 --dport 1723 -j ACCEPT
-A ufw-before-input -i lo -j ACCEPT
-A ufw-before-output -o lo -j ACCEPT
-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
-A ufw-before-input -m conntrack --ctstate INVALID -j DROP
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-forward -p icmp --icmp-type echo-request -j ACCEPT
-A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT
-A ufw-before-input -j ufw-not-local
-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
-A ufw-not-local -j DROP
-A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT
-A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT
COMMIT
我的 mac os 无法连接到服务器，当我连接时$ telnet my-ip 1723没有连接，而在$ telnet my-ip 443其他端口我可以连接，
会是什么呢？
谢谢
答案1
您使用的是 macOS Sierra 吗？
macOS Sierra 已完全删除了 PPTP 支持，请参见此处： https://support.apple.com/en-us/HT206844