Machine not reporting - WSUS on Win2k12R2 Std

Hello fellas !

I have done some research before posting and I am looking for other POV and insights on some stuff that I might miss.

• Server : Windows Server 2012 R2 Std
• Issue : Some machines aren't reporting.
• Method : Using GPO.

I have tried to remove the machine from the WSUS, forcing gpupdate on the computers and run a command that detects the WSUS. Results, they are still not reporting. I have 3 guess at this stage :

1. Firewall, UAC or Anti-Virus is preventing the process.
2. Machine does not apply correctly the GPO.
3. Connection between the server and the machine is broken.

GPUpdate does work. I did a GPResult and it does show that the WSUS GPO is enabled and applied. Other machines with the same configurations are doing fine. Test-Connection from the server to the machine is ok. I do see their IP Addresses on the WSUS Panel.

Thanks,

Nevets24