Stop MS Messaging Popups

[jserevitch]

Has anyone had those annoying popup advertisements come up on inside servers? I believe they are run through MS Messager Service. I would love to block these on my PIX. I cannot figure out which port(s) this service is using. Any help would be greatly appreciated.

[pcresswell]

Those messages are sent through NetBIOS (which I'd definately advise you to block on Windows servers connected to the Internet unless you have a specific reason to leave open).

I'm pretty sure the ports you need to block are:

137 -tcp & udp, 138 udp and 139 tcp

Pete

[crystal91]

block net send port ;

maybe udp 135, 1026