Case B)
On some firewalls, you just need to allow all connections for the Toribash executables (tb.exe and toribash.exe).
On other firewalls you may need to be specific and list IP's and ports to allow connections for.
You can use portforward's website for information on how to set up firewalls.

If your firewall is blocking Toribash's executables directly:
-- Open your firewalls settings.
-- Add 'toribash.exe' and 'tb.exe' to the exception list.
-- (These files can be found in the installation path, which by default is "C:/Games/Toribash-x.x/" (where x.x is your version number))

If your firewall requires you to specify ports and IP's:
You will need to add a range of exceptions, you should find out how to add an exception and use the IP/port list at the bottom for which exceptions to add.

If you have ZoneAlarm
ZoneAlarm has IM (Instant Messaging) protection, which blocks IRC.
You should follow the other steps and also unblock IRC by going to:
..........IM security->Settings->Advanced->Block IRC.