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Alan Duck
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outlook suddenly stopped connecting to exchange server giving certificate error

when opening outlook it fails and comes up with a certificate failure but when we view the certificate its the Federation certificate

checked the exchange Certificates and they appear to be ok.

the third part certificate Geo trust is ok

OutlookExchange

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Alan Duck

8/22/2022 - Mon
Ross McCandless

If you run this command it will show what services are assigned to which certificate
   Get-ExchangeCertificate | Format-List FriendlyName,Subject,CertificateDomains,Thumbprint,Services

The command above will show you the thumbprint of the cert you want, then run the following command (replacing the thumbprint with the correct one)
   Enable-ExchangeCertificate -Thumbprint 434AC224C8459924B26521298CE8834C514856AB -Services IIS

once that is done check IIS to make sure the correct certificate is binded


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