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Some users can not connect to their mailboxes in Exchange Server 2013 CU23

Hossein Bagheri 1 Reputation point
2020-07-28T05:52:54.117+00:00

i got this following error and there is no workaround.

[Mapi] An internal server error occurred. The unhandled exception was: System.InvalidOperationException: Operation is not valid due to the current state of the object.
at Microsoft.Exchange.Security.SspiContext.NegotiateSecurityContext(Byte[] inputBuffer, Int32 inputOffset, Int32 inputLength, Byte[] outputBuffer, Int32 outputOffset,
Int32 outputLength, Int32& inputConsumed, Int32& outputFilled)
at Microsoft.Exchange.Security.Authentication.AuthenticationContext.NegotiateGssapi(Byte[] inputBuffer, Int32 inputOffset, Int32 inputLength, Byte[]& outputBuffer)
at Microsoft.Exchange.Security.Authentication.AuthenticationContext.NegotiateSecurityContext(Byte[] inputBuffer, Int32 inputOffset, Int32 inputLength, Byte[]& outputBuffer)
at Microsoft.Exchange.HttpProxy.KerberosUtilities.GenerateKerberosAuthHeader(String host, Int32 traceContext, AuthenticationContext& authenticationContext, String& kerberosChallenge)
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<>c_DisplayClass12.<PrepareServerRequest>b_10()
at Microsoft.Exchange.HttpProxy.LatencyTracker.GetLatency(Action operationToTrack, Int64& latency)
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.PrepareServerRequest(HttpWebRequest serverRequest)
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CreateServerRequest(Uri targetUrl)
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginProxyRequest>b__15()
at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Manu Philip 16,991 Reputation points MVP
    2020-07-28T07:53:05.457+00:00

    Hi,
    Where did you find these errors? please pass more details.
    As it shows some MAPI related issues, please check if MAPI is enabled for these users in EAC->Open mailbox properties->Mailbox Features->MAPI enabled. Try to reenable the feature, if it found as enabled already

    Please mark as "Accept the answer" if the answer helps you. Your suggestion will help others also !

    Regards,
    Manu

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  2. Hossein Bagheri 1 Reputation point
    2020-07-28T16:43:40.553+00:00

    Dear Philip,
    Thanks a lot for your attention.

    Please be informed that MAPI has enabled for a long time and i got this error on my CAS servers without any modification on the system and after restarting the server the issue got resolved, i shared this error to find exact root cause to do needful action to mitigate happening issue on most important service in my company.

  3. Lydia Zhou - MSFT 2,371 Reputation points Microsoft Employee
    2020-07-29T02:42:05.29+00:00

    It's great that your issue is solved, here are more suggestions for you.

    Do you have any modification in your organization before this issue?
    How many CAS servers in your organization?

    Please also pay attention to the disk space, CPU and memory usage, check if this mailbox connection issue can be caused by the server performance.
    Since "HttpProxy" is mentioned in the error information, if the issues occur again, you can check the latest HttpProxy logs for more clues. The default location is "C:\Program Files\Microsoft\Exchange Server\V15\Logging\HttpProxy\Mapi".