Blocking MSN and other IM clients in corporate firewalls


Does anyone have a good solution on this issue? I have a couple of companies who wants to block IM totally on the firewall. Since some IM applications (like MSN messenger) is designed to bypass simple port-range blocks, I'm looking for another solution; possibly something like a list of blacklisted IP numbers that the firewall can update from time to time from a central server. The firewalls in question use Linux and netfilter.


Reply to
Jarle Aase
Loading thread data ...

Hello All,

To block access to the .Net Messenger service or MSN Web Messenger: 1. Block outbound access to TCP port 1863. 2. Block HTTP access to

If you would like to block access to MSN Web Messenger you will also need to block HTTP access to


formatting link


Reply to
Systemguy Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.