Event 1003 MSExchange Front End HTTP Proxy

Dominic Russell 1 Reputation point

Our 2013 Exchange server started an error recently, event 1003 MSExchange Front End HTTP Proxy, key certificate is not supported! As a result OWA and ECP are not working anymore.
I tried a different certificate, but the error remain. Which certificate is the error referring to? How to resolve?

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. Jade Liang-MSFT 9,961 Reputation points Microsoft Employee

    Hi @Dominic Russell ,

    Welcome to our forum!

    I tried a different certificate

    What's the certificate that you have tried?

    Event 1003 MSExchange Front End HTTP Proxy

    This error may occur when your Exchange Server OAuth certificate is expired, if you haven't checked it, please first run the following command in EMS to check the status of your OAuth certificate, for more information, please refer to this document: Can't sign in to Outlook on the web or EAC if Exchange Server OAuth certificate is expired .

    (Get-AuthConfig).CurrentCertificateThumbprint | Get-ExchangeCertificate | Format-List  

    If the command returns an error, or the certificate has expired, it's recommended to follow the document above to create and deploy a new OAuth certificate to the Exchange server.

    If that's not your case or you still need further assistance, please feel free to post back.

    If the response is helpful, please click "Accept Answer" and upvote it.
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