by Darkey Sat May 16, 2009 5:52 pm
Taken from another website, i found the reason that it is because some routers block some requests, resulting in a disconnection.
The fix should be something like this:
Disable UPnP (Universal Plug and Play)
Disable "Block Wan Requests" or something that reminds of this.
Enable "Filter NAT redirection" or something that reminds of this.
It may be required that you have access to your router, as these options most likely wont be available in Gmod settings.
This is done on a Linksys wireless router, and should work.
The solution is taken from
here