Forums General Discussion "Use random ports for listening sockets"

in "options > connect > options > advanced" there is a checkbox called "Use random ports for listening sockets".

What exactly does this do, in detail? the reason that I want to know is that my schools firewall blocks irc, but if I check this option it works anyway. Maybe I can get my prog to work trought the firewall using this, so I need detailed info. so does anyone know a doc or something explaing this, or can write a short explanation?

If your school has blocked access to IRC, I doubt anyone here will help you get round it.

They haven't blocked irc. its just that all ports are closed except port 80 and some others. and they won't open 6667 just because I want it.

And, I don't need help to get on irc. I CAN get on irc if i check the checkbox that I talked about. I just want to know how it works so I can do it in my own prog.

mIRC just picks a random local port for the TCP connection.

that wouldn't make it so it by-passes the firewall, it must do something else too.

The random local ports option makes mIRC use non-consecutive ports when creating sockets, this might help against DoS attacks trying to disable your server or dcc connections.

-Quote from mIRC help file