In my case I was using auto discovery and my client would connect to my domestic VPN gateway from a guest network. It would not however connect to Asia or European gateways manually. The message "Gateway Asia: Server certifiate verification failed" was displayed to the client.
The problem turned out to be the public IP address the client was coming from was on a route over the LAN interface of the Asia and European GP Gateways.
In this case a certificate error wasn't anything to do with the certificate and everything to do with the ROUTING to "verify" the certificate.
I added a static route on the GP gateway to override the OSPF route it was learning. This obviously could also be resolved on the OSPF side of things as well.
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