Exchange 2010: Expired Certificate Still being used

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I am getting error id 24 in MSExchange Web Services on my Exchange 2010 SP3 server - says certificate expired. That certificate has expired but I renewed it and imported the new one and assigned all the services (except unified messaging which we don't use) to it.

a) am OK to delete the old certificate?
b) why is it still being used for exchange Web Services (assume autodiscover and owa) when it does not have the IIS service role added to it?
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Systems Administrator
Did you use powershell, Enable-ExchageCertificate for all the services you're using?

You can remove the old one with Remove-ExchangeCertificate -Thumbprint "xxxx"
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017
Get-ExchangeCertificate | ft Subject,services,IsSelfSigned,NotAfter

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Run the above command and make sure only valid certificates are there in server certificate store.
Make sure expired certificate is not there.
If it is there remove it by
Remove-ExchangeCertificate -Thumbprint D18B16C10075CDE2B09BA575AF

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You will get the thumbprint by
Get-ExchangeCertificate | ft thumbprint,NotAfter

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Enable services on the right certificate. You can change services based on your requirement.
Enable-ExchangeCertificate -Thumbprint <thumbprint> -Services IIS,SMTP,POP,IMAP

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Hello OfflineGeek

No - I did it through the EMC by  clicking "Assign Services to Certificate…" under the Actions pane. Is that not a good thing?

The old certificate is displaying as having SMTP, POP and IMAP assigned but not IIS - weird.

If I remove the old one will Exchange automagically use the new one for IIS?
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Most Valuable Expert 2014
If the certificate is not showing as being used for IIS, then you should remove it. Use remove-exchangecertificate to do that.
If Exchange then rejects that, saying you cannot remove the default SMTP certificate, simply run new-exchangecertificiate (no further options) and say yes to replace the default SMTP certificate. That will generate a new self signed certificate for internal SMTP use.
You can then remove the old certificate.

Don't forget to run iisreset afterwards.



Thanks all. So the general feeling is just use the exchange powershell to remove the certfiicate? And nothing bad will happen...?
Muhammad MullaSystems Administrator

Yes, Exchange Shell is the best method of removing/enabling certificates.


Thanks again - removed using the exchange powershell as advised. Cheers!

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