HI...Ive done my share of searching and trying available solutions..blocking 1863 is no use..and blocking IP ranges with a /16 subnet range works but who want to block 64000 sites...so..what I did was the following
Install squid..dansguardian and both are working like a charm..I only need somone to advise me how to block MSN Messenger..using either IPTABLES, SQUID or DANSGUARDIAN or a combination of any of them..
It seems that MSN uses 1863 first then switches to 80 then to any open port....However, my firewall policy "Internal" is to allow access to the debian firewall unless I block the port..and I can not block port 80 using firewalls..so PLEASE HELP anyone