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Exchange 2013 – Something went wrong error in Outlook Web App and ECP

There is a known issue you may face in Exchange 2013 when you try to access outlook web app and ECP you may receive the following error:

Sorry, something went wrong

An error has occurred on the server.


If you click the TECHNICAL DETAILS link, the following text is displayed:

An unexpected error occurred and your request couldn’t be handled.

X-OWA-Error: System.NullReferenceException

X-OWA-Version: OWA Version

X-FEServer: Exchange 2013 Client Access Server

X-BEServer: Exchange 2013 Mailbox Server

Date: Date and Time

The reason of that is the GUID value is stored in the browser cookie collection and is included in an Outlook Web App or ECP request. If the GUID value that’s stored in Active Directory Domain Services (AD DS) doesn’t match, the server blocks the request.

To fix this issue, install Cumulative Update 11 or a later cumulative update for Exchange Server 2013.

Note: This update enables periodic recycle of the Outlook Web App or ECP app pools (every 14 days). If you disable this recycle functionality or set the period to more than 28 days, the issue may recur.

To download the Exchange 2013 Cumulative Update 11 you can use the following URL:

And for other Exchange 2013 Cumulative Updates you can use the following URL:

Ratish Nair

Microsoft MVP | Office Servers and Services

Team @MSExchangeGuru

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