On one of our latest Exchange 2013 installation Outlook and OWA search wasn’t working, we also noticed the following event id on the exchange server

Log Name:      Application
    Source:        MSExchangeFastSearch

Date:          11/07/2014  11:38:12 PM
      Event ID:      1010

Task Category: General                             
Level:         Warning

FAST endpoint experienced an exception. This operation may be retried. Error details:  An Exception was received during a FAST operation. —>

System.ServiceModel.FaultException: error CS1548: Cryptographic failure while signing assembly ‘c:\Windows\Temp\uooxq03v.i3z\Microsoft.Exchange.Search.Writer.12.26.dll

‘ — ‘Error signing assembly — Unknown error (8013141c)’


After trying a few thing we executed Get-MailboxDatabaseCopyStatus cmdlet to find that the Content Index state is Unknown, to resolve the issue we added  full access permission for Administrators,Exchange Servers,Exchange Trusted Subsystems accounts on the following location.

C:\Documents and Settings\All Users\Application Data\Microsoft\Crypto\RSA\MachineKeys

Rebooted the exchange server to resolve the issue.

Feel free to report any new issue on our forum to seek expert help.




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An automobile enthusiast at heart and computer geek by profession, started my Career with MS in 2005.Left Jobs and started Pledge Technologies (the parent company to Grishbi) back in 2009.We have been providing IT consulting to various Small and Medium businesses across US and UK since then.Our company specialises in Microsoft Server technologies like AD, Exchange, the rest and with numerous Office 365 migrations under our belt, we quite an expert with that too. Whatever we learn in our day to day life, we share it back on Grishbi as a Thank for all the love and support our customers have given us.
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