My computer is running Debian Etch. At the beginning, everything was fine but after I'd tried to change my proxy configurations some ports seemed to be closed. Iceweasel and other internet browsers are working fine, but I can't play wesnoth over the internet or use aMsn, Gaim and MLDonkey. I still can use sftp and telnet. I didn't have installed any firewall... What can I do to fix it? Ps: The proxy configurations may be not related to the problem.