Is there a way to block ppl using Instant messenger recieving any files

[shabib.syed]

I am not sure if this is answered previously but if someone knows and help me out here

Is there a way to block ppl using Instant messenger recieving any files thru that. Also How to block different peer to peer file sharing softwares out there. I have a PIX 515 (6.1). Any help will be greatly appreciated.

Thanks

[yusuff]

MSN uses TCP port 1863 for chat. Not sure but either it uses the same port or some high TCP port to transfer files. You can put a sniffer and see what ports is it sending the files through and block them. For your reference, below are some other port info.

common chat ports:-

tcp 1863 (msn)

tcp 6667 (irc) 6660- 6670 (the default being 6667).

tcp 6665-6669 (common IRC)

tcp 5190 (aol)

tcp 5190, dyn >=1024 (aol ICQ)

tcp/udp 5190-5193 (aol)

tcp/udp 4020 (ichat)

tcp 5000-5001 and udp 5000-5010 (Yahoo voice chat)

tcp 5050 (Yahoo messages)

tcp 5100 (Yahoo Webcams)

HTH

R/Yusuf