OWA and ECP doesn't work after update KB5004780

Marc Meul 11 Reputation points
2021-07-14T09:06:21.837+00:00

Hi,

After installing the update KB5004780 OWA and ECP doesn't work anymore.

The error in the eventviewer doesn't give me enough information.
I can't find anything useful online about the error message.

Anyone else out there with something similar or a better solution?

Kind regards,
Marc

Process information:
Process ID: 2064
Process name: w3wp.exe
Account name: NT AUTHORITY\SYSTEM

Exception information:
Exception type: ExAssertException
Exception message: ASSERT: HMACProvider.GetCertificates:protectionCertificates.Length<1
at Microsoft.Exchange.Diagnostics.ExAssert.AssertInternal(String formatString, Object[] parameters)
at Microsoft.Exchange.Diagnostics.ExAssert.RetailAssert[T1,T2](Boolean condition, String formatString, T1 parameter1, T2 parameter2)
at Microsoft.Exchange.Clients.Common.HmacProvider.GetCertificates()
at Microsoft.Exchange.Clients.Common.HmacProvider.GetHmacProvider()
at Microsoft.Exchange.Clients.Common.HmacProvider.ComputeHmac(Byte[][] messageArrays)
at Microsoft.Exchange.HttpProxy.FbaModule.SetCadataCookies(HttpApplication httpApplication)
at Microsoft.Exchange.HttpProxy.FbaFormPostProxyRequestHandler.HandleFbaFormPost(BackEndServer backEndServer)
at Microsoft.Exchange.HttpProxy.FbaFormPostProxyRequestHandler.ShouldContinueProxy()
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.BeginProxyRequestOrRecalculate()
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalOnCalculateTargetBackEndCompleted(TargetCalculationCallbackBeacon beacon)
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<>c__DisplayClass280_0.<OnCalculateTargetBackEndCompleted>b__0()
at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func2 filterDelegate, Action1 catchDelegate)
at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Marc Meul 11 Reputation points
    2021-07-15T07:00:40.753+00:00

    Hi @Yuki Sun-MSFT ,

    Thanks for your response, I've already tried that but with no luck.
    Maybe I didn't wait long enough. I will try again.

    For now uninstalling the patch did the job; but that is not a real solution. But ECP and OWA works again.

    Thanks for the link; I will follow that thread to.

    Many people suffer from it. This is also an interesting link
    https://techcommunity.microsoft.com/t5/exchange-team-blog/released-july-2021-exchange-server-security-updates/bc-p/2548895/highlight/true#M30832

    1 person found this answer helpful.

  2. Yuki Sun-MSFT 40,781 Reputation points
    2021-07-15T04:26:41.767+00:00

    Hi @Marc Meul

    Please follow the steps in the article below to re-publish the Oauth certificate, then wait for a few hours for the change to take place:
    Can't sign in to Outlook on the web or EAC if Exchange Server OAuth certificate is expired

    Here's a similar case for reference: Exchange Server error in '/owa' application.


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  3. 2021-08-02T03:29:12.313+00:00

    The fix suggested is definitely working. Please be patient grab a coffee and check back later. I had to give it 3 hours for it to work.

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  4. alex a 61 Reputation points
    2021-08-25T14:49:15.927+00:00

    Works for me too.
    Take 2h and a half for me (i have no more hairs...)

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  5. alex a 61 Reputation points
    2021-08-25T14:51:03.44+00:00

    Worked for me too and take 2 hours and half

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