server address blacklisted ?

[c4os]

Hi all,
two days ago i was able to reach my vpn server through company proxy using port 443.
This morning i try to reconnect the client but a new message appears on log:

Tue Apr 12 13:56:58 2011 Attempting to establish TCP connection with proxyserver:84
Tue Apr 12 13:56:58 2011 TCP connection established with proxyserver:84
Tue Apr 12 13:56:58 2011 Send to HTTP proxy: 'CONNECT vpnserver:443 HTTP/1.0'
Tue Apr 12 13:57:04 2011 recv_line: TCP port read timeout expired
Tue Apr 12 13:57:04 2011 TCP/UDP: Closing socket

Could be my server ip address blacklisted on proxy ?
And if it's on blacklist, how can i solve this new unexpected issue ?

Any help will be appreciated
-c4os

[janjust]

find another proxy server...
it definitely looks like the proxy server is not responding - whether that is a server fault or an admin who blacklisted your client is not certain.

Try getting a different IP for your client inside the corporate network and try again (or ask a colleague if it works for them).

[c4os]

Hi janjust,

you think is the proxy that not responding ?
Couldn't be my ip on port 443 ? 'cause i see tcp connection established between me and proxy. The timeout is the command CONNECT on tpc remote address... correct me if i'm wrong

[janjust]

either is possible: either they've blacklisted the server IP or they've blacklisted all clients which attempt to establish a non-HTTPS connection over an HTTPS port...

[c4os]

uhmmm today i've tried some possibility and one thing is strange...
Why if i use another proxy on port 80 i have this kind of log ?

Wed Apr 13 17:11:15 2011 TCP connection established with 139.23.33.22:80
Wed Apr 13 17:11:15 2011 Send to HTTP proxy: 'CONNECT vpnserver:80 HTTP/1.0'
Wed Apr 13 17:11:17 2011 HTTP proxy returned: 'HTTP/1.1 200 OK'
Wed Apr 13 17:11:17 2011 TCPv4_CLIENT link local: [undef]
Wed Apr 13 17:11:17 2011 TCPv4_CLIENT link remote: 139.23.33.22:80
Wed Apr 13 17:11:17 2011 Connection reset, restarting [0]


why the link remote is the proxy itself? O_o
it should be my vpnserver...

[janjust]

the vpn client has a direct TCP connection with the proxy server, not with your vpn server; so it seems that the proxy server is resetting the connection (unless you see something interesting/funny in your openvpn server logs)