KanBo How To: Find out the certificate expiration dates On-Premise
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Find out the expiration dates of your On-Premise Certificates
With the following line you will get a list of Certificates which will expire within the amount of days you are interested in (please just fill in the amount of days you are interested in, in our example it is 300 "Expiringindays")
get-childitem -path cert: -recurse -Expiringindays 300 | Select-Object Issuer, NotAfter, Subject, FriendlyName | FL
You will get a list of Certificates with details including the expiration date.
To renew the high trust certificate, please follow the instructions in the corresponding article here.