OCS Mac Messenger Certificate Trust Errors with DigiCert

If you’re getting an error from Mac Messenger about the digital certificate file being invalid when trying to sign-in to OCS, you may need to tweak the root config on your OCS servers.


The good news is the fine folks over at DigiCert have compiled some simple steps that outline how to do this. You’ll need to reboot after you do them.

Warning: The steps outlined above will immediately render the OCS services inoperable and will require a reboot to straighten things out. DO NOT do this during production hours!


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