openvpn connection always reset, need help

[fromMars]

When I connected to a server use "sudo openvpn configfile", it always return this:

Initializing openvpn connection ...
Sun Jun 8 09:04:20 2014 OpenVPN 2.3.4 x86_64-unknown-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [MH] [IPv6] built on Jun 8 2014
Sun Jun 8 09:04:20 2014 library versions: OpenSSL 1.0.1 14 Mar 2012, LZO 2.06
Sun Jun 8 09:04:20 2014 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.
Sun Jun 8 09:04:20 2014 Socket Buffers: R=[87380->131072] S=[16384->131072]
Sun Jun 8 09:04:20 2014 Attempting to establish TCP connection with [AF_INET]180.227.155.110:1389 [nonblock]
Sun Jun 8 09:04:21 2014 TCP connection established with [AF_INET]180.227.155.110:1389
Sun Jun 8 09:04:21 2014 TCPv4_CLIENT link local: [undef]
Sun Jun 8 09:04:21 2014 TCPv4_CLIENT link remote: [AF_INET]180.227.155.110:1389
Sun Jun 8 09:04:21 2014 Connection reset, restarting [-1]
Sun Jun 8 09:04:21 2014 SIGUSR1[soft,connection-reset] received, process restarting
Sun Jun 8 09:04:21 2014 Restart pause, 5 second(s)
^CSun Jun 8 09:04:23 2014 SIGINT[hard,init_instance] received, process exiting

I don't know why it always reset the connection, may you give me some advice?

[thisjun]

Could you check the VPN server log? There is possibility that work Dos protection function.
And we need more information of your environment etc.
Please see here http://www.vpnusers.com/viewtopic.php?f=7&t=2790