Something like this? Server requires support for x86-64-v2 instructions
I upgraded to a newer set of hardware for my server and everything is working.
However it might just be a matter of asking your server provider to forward the relevant CPUID bits as d-bubble stated in the thread!
The warning in the client happens because you are running a server version that is older than two weeks. The only way around this message is to upgrade to one of the newest versions or downgrade to the latest recommended version (5848).