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Instant
Messaging:
IM Blocking
Instant Messaging (IM) involves direct connections between workstations
either locally or across the Internet. Using this feature of the
Web Filter, groups and/or individual client machines can be set up to
block IM services specified in the library category. (See Blocked
IM and P2P Clients and Services for details on blocked
IM components and features.)
How IM Works
When the IM module is loaded on the server, the Web Filter compares
packets on the network with IM libraries stored on the Web Filter.
If a match is found, the Web Filter checks the user’s profile
to see whether the user’s connection to the IM service should
be blocked, and then performs the appropriate action.
WARNING: The following items are known issues pertaining to the
IM module:
• IM can only block by destination IP address if network traffic
is being tunneled, sent through a Virtual Private Network (VPN),
or encrypted.
• IM will not be blocked if a client-side VPN is set up to
proxy traffic through a remote IP address outside the connection
protected by the Web Filter.
• Some versions of the AOL client create a network interface
that send a network connection through a UDP proxy server, which
prevents blocking IM.
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