What ports do I need to block to attempt to prevent IM on my network?
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
To prevent IM, try the following:AOL: In and outbound TCP port 4443
AOL: *ALL access to login.oscar.aol.com on all port .NET: In and outbound TCP 6891
.NET: UDP Ports 13324 & 13325
.NET: TCP Port 1503
.NET: msgr.hotmail.com Yahoo: Block all in and outbound TCP Port 5010
Yahoo: *ALL *.msg.*Yahoo.com AOL.ICQ: Block In and out TCP Ports 5190 & 4001, UDP 4000
AOL.ICQ: Block ports 3474 and 7320 for TCP
AOL.ICQ: Block all TCP 5190, 4001 & UDP 4001 & 4000 to login.icq.com Further information can be found at http://www.infosecuritymag.com/2002/aug/cover.shtml.
For more information on this topic, visit these other SearchSecurity.com resources:
Best Web Links: Secure messaging
News & Analysis: The risk and intrigue of IM to the enterprise
Web Security Tip: Prevent hackers from sneaking in through IM
Dig Deeper on Email and Messaging Threats-Information Security Threats
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.