North American Network Operators Group
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More ports to block

  • From: Sean Donelan
  • Date: Wed Sep 24 13:33:33 2003 
Pop-Up Scam Beats AOL Filter

http://www.wired.com/news/technology/0,1282,60564,00.html
AOL is not the only Internet service provider currently blocking all port
135 traffic. Many ISPs began filtering the port last month to mitigate the
spread of the MSBlaster computer worm, Baldwin said. While AOL also could
block UDP ports 1025-1029 to fully eliminate Messenger service spams, the
big ISP likely is worried about the potential "collateral damage" such a
move might cause to users with legitimate programs that require those port
addresses, he said.