Microsoft KB Archive/312357

= Error Message: Event ID 1722: An Unknown SMTP Command Occurred =

Article ID: 312357

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition

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This article was previously published under Q312357



SYMPTOMS
If you have Internet Security and Acceleration (ISA) Server installed with Simple Mail Transport Protocol (SMTP) content filtering enabled, the following event may occur:

Event ID 1722: An unknown SMTP command occurred



CAUSE
If the SMTP content application filter is installed, you must explicitly state which SMTP commands are permitted. Event 1722 occurs if you do not explicitly state the SMTP commands that are in use.



RESOLUTION
To resolve this issue, add the appropriate SMTP command in the application filter. Or, you can disable SMTP content filtering if it is not necessary.

Keywords: kbenv kberrmsg kbprb KB312357

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