openvpn TLS Error 及穿透防火墙

OpenVPN配好了，客户端连接时却报以下错误

TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
TLS Error: TLS handshake failed

查阅资料，说是网络有可能有问题，路由器没有开nat，或者其它的网络问题。

想来可能是防火墙限制了，是否是防火墙的问题，需要试一下
有两种方式，第一种方式，使用不受限的SSL端口443和TCP协议

#/etc/openvpn/server.conf
Server
...
# Which TCP/UDP port should OpenVPN listen on?
# If you want to run multiple OpenVPN instances
# on the same machine, use a different port
# number for each one. You will need to
# open up this port on your firewall.
port 443 # TCP or UDP server?
proto tcp2
;proto udp
...
# SSL/TLS root certificate (ca), certificate
# (cert), and private key (key). Each client
# and the server must have their own cert and
# key file. The server and all clients will
# use the same ca file.
# 

第二种，使用http代理
利openVPN自带的http-proxy突破防火墙的封锁


使用第一种方式配完后，果然连上了。