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Olex123411's avatar
Olex123411
Copper Contributor
Dec 23, 2025

Microsoft Exchange refers to an older certificate that no longer exists, ID 12023.

We have one Microsoft Exchange 2013 server. The Windows Application log periodically displays the ID 12023 entry, which states that Microsoft Exchange could not load the certificate with the thumbpri...
2013
error ID12023
Exchange Server
Andres-Bohren's avatar
Andres-Bohren
Iron Contributor
Jan 14, 2026

Hi Olex123411​ 

Check everywhere where Certificates are involved

Get-ExchangeCertificate
Get-SendConnector | fl identity, *tls*
Get-ReceiveConnector | fl identity, *tls*
Test-FederationTrustCertificate

Check Certificate on IIS for "Default Web Site" and "Exchange Back End"

Kind Regards
Andres

  • Olex123411's avatar
    Olex123411
    Copper Contributor
    Jan 21, 2026

    No, it didn't help.

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