I have a number of machines (servers and workstations) that are failing when I try to activate them using our KMS server.
The server has been running fine for over a year but recently has been failing activation of our Windows machines.
I can update license status and even install a product key remotely but when I try to activate the same machine it fails...
"No Key Management Service (KMS) could be contacted." The event log show the attempt and nothing else.
Pretty much the same thing happens when I try to activate a machine from it's cmd prompt... "slmgr /ato" fails with error 0xC004F074 ..."The Key Management Service (KMS) is unavailable"
KMS and WMI rules are enabled in Windows firewall on both machines
KMS Server = Server 2008 R2 Enterprise 64bit
target server = Windows 2008 R2 Standard 64bit