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prashanthpurushotham's avatar
prashanthpurushotham
MCT
Jul 06, 2024

Mixed Exchange Server ECP portal not accessible

We have 4 servers, 2 exchange 2013 servers and 2 exchange 2016 servers, if all the servers are on ECP porta is accessible, but if we turn off 2 exchange 2013 servers, then ECP portal is not accessibl...
Exchange Server
  • AnnTaeYoun's avatar
    AnnTaeYoun
    MVP
    Jul 08, 2024

    prashanthpurushotham 

    Thank you for your reply with detailed information.

    Since the issue does not occur when the Exchange 2013 servers are online,
    compare the configurations of the virtual directories and authentication settings between Exchange 2013 and Exchange 2016.

    Get-EcpVirtualDirectory | fl Server,InternalUrl,ExternalUrl,InternalAuthenticationMethods,ExternalAuthenticationMethods
    Get-OwaVirtualDirectory | fl Server,InternalUrl,ExternalUrl,InternalAuthenticationMethods,ExternalAuthenticationMethods
    Get-ClientAccessService | fl Name,AutodiscoverServiceInternalUri,AlternateServiceAccountCredential
    Get-ExchangeCertificate | fl Thumbprint,CertificateDomains,IsSelfSigned,Services,Subject,NotAfter

    Ensure that redirection settings in IIS for the ECP and OWA virtual directories do not inadvertently cause issues.

      • AnnTaeYoun's avatar
        AnnTaeYoun
        MVP
        Jul 09, 2024

        prashanthpurushotham 

        Your detailed reply was very helpful in my review.
        The following servers are using self-signed certificates:

        VOH-SOU-VM-EX1
        VOH-SOU-VM-EX6

        [Action Item]
        Ensure that all Exchange servers use the same publicly trusted SSL certificate.
        In the IIS Manager Console, unify the SSL binding settings for “Default Webs Site” and “Exchange Back End” with a public certificate!