exchange 2013 OWA An unexpected error occurred and your request couldn't be handled. X-OWA-Error: System.NullReferenceException

something went wrong

An unexpected error occurred and your request couldn't be handled.
X-OWA-Error: System.NullReferenceException
X-OWA-Version: 15.0.847.32
X-FEServer: SRVOWAxx
Date: 12/06/2015 23:02:53

Same issue for OWA en ecp

IIS services are started
All pool services are started
manuverhaegenSystem & Storage AdminAsked:
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Amit KumarCommented:
Please refer this article OWA_Error, and see if mentioned events are there on your servers.

Once you are confirmed that events are there and this article can be a remedy for this issue so take backups as required and then proceed with changes.
manuverhaegenSystem & Storage AdminAuthor Commented:
There are no events in the application event log
manuverhaegenSystem & Storage AdminAuthor Commented:
When I open the owa URL on the server desktop then we get the login page

After logon : 500
unexpected error :(

An error has occurred and your request could not be completed. Try again.
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Amit KumarCommented:
First try to failover your databases and see if any event is coming on mailbox server or on CAS server.
manuverhaegenSystem & Storage AdminAuthor Commented:
I have only 1 database server and 1 CAS server
Amit KumarCommented:
Then there must be some events, try to reboot both servers. First CAS server then mailbox server.

Did you installed any RU recently on servers?
manuverhaegenSystem & Storage AdminAuthor Commented:
I have use the following sollution:

difference with the above LINK click on recycle not on Recycling then it work.

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manuverhaegenSystem & Storage AdminAuthor Commented:
Amit Kumar Goyal has made me think in the right direction.
Oliver ChitsamatangaCommented:
how do you install adsiedit ?  on a windows 7 pro sp1?
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