Fixing ISP mydoom worm port blocking

Fixing ISP mydoom worm port blocking Fixing ISP mydoom worm port blocking Hi folks,

This page is fixing your problem with ISP, Internet Service Provider, port blocking designed to stop propogation of the MyDoom and variant worms.

These worms (or at least the first generation) use TCP ports 3127 through 3198. (From Symantec link above)

When a computer is infected, the worm sets up a backdoor into the system by opening TCP ports 3127 through 3198, which can potentially allow an attacker to connect to the computer and use it as a proxy to gain access to its network resources. In addition, the backdoor can download and execute arbitrary files.

You will see a whole bunch of tiny "Google" favicon.ico icons try to load. You may recognize these from your Web browser's address line.

What is happening is your browser is trying to load a bunch of icons, some of which don't exist. As each one is established, another web connection is tried.

If you bring up an

Windows DOS Prompt or
a MacOS X Terminal, via Applications/Utilities/Terminal,
a UNIX shell or
a Linux Shell

You can then run the same command on all these operating systems:


netstat -an | more

You may notice SYN_SENT, ESTABLISHED and TIME_WAIT states (and possibly some others) The ones which have a destination ending in 80 or HTTP or http are web connections. Look to the left and see the numbers climbing past 3198 on the source ports. Your web browsing will soon be good as new. That is until the port numbers pass around the "top" number and start back from 1 (or so). Then just visit this page again. Thanks, Brian Cusack and Chris Lent

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