I have an interesting situation.
After walking around the building yesterday, I found a few people using
AOL's Internet Messenger. I didn't think it should work over our firewall.
After some testing, it appears that these people are sneaking through the
firewall on port 80. AOL IM will send messages through any available port.
I could stop this directly by blocking traffic to login.oscar.aol.com (the
login server), but I am not sure it is worth it. Is IM a security risk? It
appears to use AOL as a proxy, so there are no direct connections to the
client (as in ICQ and others).
Thanks for the help.
Jay S. Schulman
Corporate Network Administration
Suntory Water Group - Chicago
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