Can't RDP / Network Share Across Subnet

I have 1 Server that can't RDP or be RDP'd, access file shares or have its file shares accessed from other servers on a different subnet. 

I can access the file shares and RDP to and from it from other servers in the same subnet. 

Windows Firewalls are off, no I cannot change the IP address for testing because web and application services are dependent upon it. 

Other servers can access shares and RDP across the subnets just fine. It's literally just this 1 server that's having the issue.