Comment 2 for bug 682995

I agree, this seems unlikely to happen. In comparison, it only took a day for our network guys to open up port 11371 for me :)

What's bad are the generic network error messages that Synaptic and add-apt-repository emit when the port is blocked. Neither really give a hint that it might be a port problem. If at least they reported what port they're trying to connect on, that would give the user a much chance of guessing that it's a firewall problem.