Not Sure now to check DNS name resolution for that one server.
What I did was remove the Unknown a second time in Forward Lookup Zone. But this time I added 192.168.1.220. For the Reverse Lookup Zone, I selected edit, then Resolve and selected 192.168.1.220.
That seemed to fix the PTR record query for the 126.96.36.199.in-addr.arpa. failed on the DNS server