OpenVPN TCP 443

Question

我正在我的Ubuntu16.04.3上运行一个2.4.4版本的OpenVPN服务器。VPN连接在UDP 1194中工作得非常好，但是当我试图切换到TCP 443时，它就不会连接了。我使用的是apache2，在使用service apache2 stop命令进行测试之前我关闭了它。ufw 443是允许的，但即使我关闭防火墙，它也不会连接。(也在Windows客户端上)

以下是我的服务器配置：

port 443
proto tcp
;proto udp
dev tun
ca ca.crt
cert server.crt
key server.key
dh dh2048.pem
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "redirect-gateway def1 bypass-dhcp"
push "dhcp-option DNS 213.133.98.98"
push "dhcp-option DNS 213.133.99.99"
push "dhcp-option DNS 213.133.100.100"
keepalive 10 120
tls-auth ta.key 0
key-direction 0
cipher AES-256-CBC
tls-cipher TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384
auth SHA512
max-clients 2
user nobody
group nogroup
persist-key
persist-tun
status openvpn-status.log
verb 3
explicit-exit-notify 1
tls-version-min 1.2
reneg-sec 60
remote-cert-tls client

我的客户机配置：

client
dev tun
proto tcp
;proto udp
remote *super secret IP* 443
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
tls-auth ta.key 1
cipher AES-256-CBC
tls-cipher TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384
auth SHA512
key-direction 1
auth-nocache
reneg-sec 60
verb 3

客户日志：

Fri Nov 10 13:35:05 2017 SIGUSR1[soft,connection-reset] received, process restarting
Fri Nov 10 13:35:05 2017 MANAGEMENT: >STATE:1510317305,RECONNECTING,connection-reset,,,,,
Fri Nov 10 13:35:05 2017 Restart pause, 5 second(s)
Fri Nov 10 13:35:10 2017 TCP/UDP: Preserving recently used remote address: [AF_INET]*super secret IP*:443
Fri Nov 10 13:35:10 2017 Socket Buffers: R=[65536->65536] S=[65536->65536]
Fri Nov 10 13:35:10 2017 Attempting to establish TCP connection with [AF_INET]*super secret IP*:443 [nonblock]
Fri Nov 10 13:35:10 2017 MANAGEMENT: >STATE:1510317310,TCP_CONNECT,,,,,,
Fri Nov 10 13:35:11 2017 TCP connection established with [AF_INET]*super secret IP*:443
Fri Nov 10 13:35:11 2017 TCP_CLIENT link local: (not bound)
Fri Nov 10 13:35:11 2017 TCP_CLIENT link remote: [AF_INET]*super secret IP*:443
Fri Nov 10 13:35:11 2017 MANAGEMENT: >STATE:1510317311,WAIT,,,,,,
Fri Nov 10 13:35:11 2017 Connection reset, restarting [0]

服务器日志：

Nov 12 18:22:22 ubuntu systemd[1]: Starting OpenVPN connection to server...
Nov 12 18:22:22 ubuntu systemd[1]: Starting OpenVPN service...
Nov 12 18:22:22 ubuntu systemd[1]: Started OpenVPN service.
Nov 12 18:22:22 ubuntu systemd[1]: Failed to start OpenVPN connection to server.

ip addr show tun0与UDP 1149：

12: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 100
    link/none
    inet 10.8.0.1 peer 10.8.0.2/32 scope global tun0
       valid_lft forever preferred_lft forever

使用TCP443的ip addr show tun0：

Device "tun0" does not exist.

有人知道为什么当我切换到TCP 443时它不能工作吗？

Answer 1

好了，我找到解决办法了！坦克到djsumdog给我的提示与日志附加选项。文件中的错误：Options error: --explicit-exit-notify can only be used with --proto udp，所以当我想要使用TCP时，我不能使用这个选项。现在一切都很好。

Answer 2

可能openvpn服务器无法将特权端口绑定到：

用户无人分组

试着

用户根组根

看看能不能行。