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Intermittent Kerberos double hop problem

  Asked By: Bhavika    Date: Mar 09    Category: Sharepoint    Views: 1244

The request to a reporting services web service (on reportserver) is
being requested (from WEF) with a trusted account, using SSL and
Kerberos.

Some requests are ok and the report is sent back, but some give 401
unauthorized. (Just for the report web-part)

Looking at the event viewer of the report server i noticed the
failed requests are being made as a kerberos request with NT
AUTHORITY\SYSTEM and the source IP is the WFE.

This affects about 20% of the users.
My server spn settings are as follows
For the MyreportServer:
http/anotherURL.xxxx.com
SMTPSVC/MyreportServer.xxxx.com
SMTPSVC/MyreportServer
HOST/MyreportServer
HOST/MyreportServer.xxxx.com

For the WFE:
SMTPSVC/MyWFE.xxxx.com
SMTPSVC/MyWFE
HOST/MyWFE
HOST/MyWFE.xxxx.com

This server accounts are trusted for delegation in AD

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