We use a Ubuntu openVPN VM as a VPN server for 3CX - Yealink phone clients. I recently migrated the VM to a new ESXi 5.5 server. Now the clients won't register. All IP configs remained the same. I've re-enabled the original VM on the original host and we are back in operation. However I need to resolve this soon as the hardware on the old host is iffy. I acquired this installation and have limited knowledge of OpenVPN.
Is this a MAC address issue in OpenVPN? Do I need to recreate the tar file on the new host? Hoping it's a quick config edit not a re-deployment.