Troubleshoot SSL certificates and keys

If you get an error like this in the Apache error log file, it is because an incorrect certificate or key is in use.

[Mon May 12 15:37:46.891294 201X] [ssl:emerg] [pid 15450] AH02565: Certificate and private key example.com:443:0 from installdir/apps/your_app/conf/certs/server.crt and installdir/apps/your_app/conf/certs/server.key do not match

• Verify that the current key matches the certificate file with the following commands. Note that the SHA checksum of the key and certificate must match.

  • Check your certificate:

    $ openssl x509 -in server.crt -pubkey -noout -outform pem | sha256sum
    

  • Check your key:

    $ openssl pkey -in server.key -pubout -outform pem | sha256sum
    

The output of the two commands above should match. In case of a mismatch, the wrong key is in use for the certificate and so Apache will not start until the issue is resolved.