When you say "any server", do you mean any server from your network, or any server on any network?
Have you added new software to your computer? Did your antivirus/antispyware/firewall do an automatic update that messed everything up? Do you have this same problem if you connect from another computer, or another user on your computer?
Post the results of this command:
//echo -a $md5($mircexe,2) $script(0) $dll(0) $com(0)