0xC004F074: the Windows Server hosting Exchange cannot reach a KMS host
0xC004F074 leaves the Windows Server hosting Exchange unactivated and nagging. Learn the KMS and DNS checks and the licence that ends it for good.
Office 0x8007007B: the KMS host name is malformed or does not resolve
Error 0x8007007B after ospp.vbs /sethst means the KMS host name is malformed or does not resolve in DNS. See the correct syntax and both fixes.
0x8007007B and 0x800706BA: Wrong KMS Host Name or Port 1688 Blocked
0x8007007B is published by Microsoft as a DNS name that does not exist; 0x800706BA is the RPC server being unreachable. Here is how to tell them apart.