When you say "every" server, have you tried other networks than DALnet as all I see in your paste is DALnet servers. You might try irc.undernet.org
and see if it's every network, if you haven't tried that already.
If you absolutely have to connect through a proxy then you need to edit mIRC's proxy settings. This is accessible at ALT+O
. Extensive help can be found at http://www.mirc.co.uk/help/proxies.html