Microsoft KB Archive/888644

= An ISA Server 2004 firewall client may be unable to connect to an ISA Server 2000 computer that requires a UDP-only control channel =

Article ID: 888644

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition

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SYMPTOMS
A Microsoft Internet Security and Acceleration (ISA) Server 2004 firewall client may be unable to connect to the following servers:
 * A Microsoft Proxy Server 2.0 computer
 * An ISA Server 2004 computer that requires a User Datagram Protocol (UDP)-only control channel
 * A Microsoft ISA Server 2000 computer that requires a UDP-only control channel



CAUSE
By default, UDP control channel support is disabled in ISA Server 2004 firewall clients.

Note In earlier versions of ISA Server, the firewall client control channel uses TCP and UDP port 1745.



RESOLUTION
To resolve this issue, enable UDP control channel support on the ISA Server 2004 firewall client. For more information about how to enable UDP control channel support, visit the following Microsoft Web site:

http://go.microsoft.com/fwlink/?LinkId=61926



MORE INFORMATION
For more information, visit the following Microsoft Web site:

http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/faq-clients.mspx

Keywords: kbtshoot kbprb KB888644

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