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Entrust Certificate Services Support Knowledge Base

Last Modified: 2016-09-07 15:42:15.0

Why do I get the error “This certificate is invalid for use with Exchange – Reason: Private key missing”?

Article Number: 46395

Question:
Why do I get the error “This certificate is invalid for use with Exchange – Reason: Private key missing”?

Answer:
If you are getting this error message when you run the Enable-ExchangeCertificate command in Exchange 2007, this means that Windows is having problems finding the private key associated with your certificate.

You can try the following to recover your private key: 

1 – Open your SSL certificate file in .cer/.crt format and click on the Details tab Write down the Serial number.

2 – Open up a command prompt (Start > Run; then enter CMD to open a command prompt) and enter the following command:

Certutil –repairstore my <SERIAL_NUMBER_WITH_NO_SPACES>

 


3 - If this command completes successfully, go back to your Exchange Powershell and re-run the Enable-ExchangeCertificate command to activate your certificate.

 

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