Comment 6 for bug 1805920

I'm not positive this will work, but maybe if you do something like this on the trunk port connected to the server, it will do what you want?

    switchport trunk native vlan <vid>

This causes the switch to assume untagged traffic is on <vid>. It might also cause the tag for that VID to be stripped before it egresses the port, but there is some debate on that point, and I'm not enough of a Cisco expert to tell you the behavior for sure. ;-)