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Exchange OWA suddenly unavailable for 30 minutes

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Hi,

We just had a problem where one would browse to OWA, sign on with any given user, and get the ":-( something went wrong"-message.

Upon viewing the logs, error-events were shown with the following detailed info:

source: MSExchange OWA

eventID: 137

task category: core

System.ArgumentOutOfRangeException: The performance counter: "Current Users" is not supported to be updated by method Globals.IncrementCurrentUsersCounterBy(). Parameter name: performanceCounter at Microsoft.Exchange.Clients.Common.PerformanceCounterManager.IncrementCurrentUsersCounterBy(ExPerformanceCounter performanceCounter, Int64 incrementValue) at Microsoft.Exchange.Clients.Common.PerformanceCounterManager.DecrementUserPerfCounters(String userName, Boolean isProxy, Boolean isLightExperience) at Microsoft.Exchange.Clients.Owa2.Server.Core.UserContextManager.TerminateSession(UserContext userContext, CacheItemRemovedReason abandonedReason) at Microsoft.Exchange.Clients.Owa2.Server.Core.UserContextManager.UserContextRemoved(Object parameters)

The only thing I did was restart IIS (after which the problem persisted) and begin the updating process. Anyone have a clue what may have caused this error?


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