MSN Messenger and Windows Live Messenger
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Natively uses port 1863 and bypasses the Squid proxy. But when that has been locked down by the firewall admin it will failover to port 80 and enter Squid.
Microsoft This is only confirmed to work with MSN Messenger and Windows Live Messenger if there is any other parts to the formal name its maybe another program completely with different access needs.
Squid Configuration File
Configuration file to Include:
# MSN Messenger acl msn urlpath_regex -i gateway.dll acl msnd dstdomain messenger.msn.com gateway.messenger.hotmail.com acl msn1 req_mime_type application/x-msn-messenger http_access deny msnd http_access deny msn http_access deny msn1