Forefront UAG Troubleshooting: Event ID 160: The Authentication Request for the Site Does Not Match the Expected Trunk Name

Forefront UAG Troubleshooting: Event ID 160: The Authentication Request for the Site Does Not Match the Expected Trunk Name

SymptomsWhen end users attempt to access the Forefront UAG portal, they may receive the following message "The trunk name in the received request does not match the expected trunk name." There may also be an event 160 in the event viewer or in the Web Monitor with the description "ADFSv2Site: Authentication request for site [requested_site] does not match the expected trunk name [trunk_name]. Session ID: [session_ID]."

CauseIf you published more than one trunk using federated authentication, an end user may sign in to one trunk and then try to access another trunk from their authenticated session. However, because they have not authenticated to the second trunk, the attempted access will fail.

SolutionIf there are only a few occurrences of this event in the event viewer, you can ignore the events. If you see many occurrences of this event in the event viewer, it could be indicative of malicious user activity.

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  • Patris_70 edited Revision 7. Comment: deleted (en-US) title

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  • Ed Price MSFT edited Revision 2. Comment: Updated title and tags.

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  • Thanks for these great articles.

    I'm trying to understand why these were all tagged with ADFS 2.0?

    Can UAG only be used with ADFS 2.0 - so that is why you are hardwiring a relationship?

  • Ed Price MSFT edited Revision 2. Comment: Updated title and tags.

  • Andrew,

    This particular event mentions ADFS. So it seems to fit for this article. Not sure about the others.

  • Patris_70 edited Revision 4. Comment: added en-US title

  • Patris_70 edited Revision 7. Comment: deleted (en-US) title

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