Going through a firewall
Tue Feb 11 14:01:01 2003
I know this is a long shot, but....
I'm trying to access my home PC from my office PC, which is behind a *big* (ie. well-thought out and solid) corporate firewall, using TightVNC (server at home, client in the office). To cut a long story short, it seems I haven't been able to worm a way through the firewall. I've tried using ports 21 or 80 on both machines, and also the built-in HTTP server. Using TightVNC client, I get no connection on either port. Using the HTTP server, I can connect to my home PC via my web browser and download the applet, and get to the password req screen. However, after entering the password, the applet then times out on the connection.
I'd guess this is a straightforward block by the firewall based on the traffic type (the fact I can get something on :21 and :80 implies the ports themselves are open, and I can establish an FTP connection to elsewhere on :21). Command line pings don't work, probably because they're unaware of the firewall - hence the reason I tried the HTTP method (using the proxy server settings in IE5). I'm guessing that the firewall (proxy:8080) is filtering out the VNC data packets, even though they're being handled through port 80.
Just wondering if anyone has had this situation, and found a way through? Is there a tunneling protocol that can 'disguise' itself as standard web browser packets, for example (excuse my ignorance!)?