Outgoing ICQ 2000 Traffic Not Passing Through Internet Security and Acceleration Server (279340)

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You may be unable to have outbound network traffic pass through ISA Server when you use ICQ 2000b beta version for client-to-server connectivity, even if you have the ICQ protocol definition enabled for outbound access. Earlier versions of ICQ do not experience this problem.

ICQ 2000b beta version uses Transmission Control Protocol (TCP) port 5190, which is the same port used in the protocol definition for AOL Instant Messenger.

If you add AOL Instant Messenger to the list of permitted protocols, you may be able to use ICQ 2000b beta version to connect to ISA Server.

NOTE: A client-to-client connection that uses ICQ 2000b beta version can be performed with the TCP protocol, using port range 1024-65535. The client needs an open listening port in the previously mentioned range (1024-65535). In this case, the Firewall Client for ISA Server must also be used on the client.

For more information on the preceding third-party product, contact the manufacturer or visit the ICQ Web site: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.