(Additional) Windows Server not working

OS Name/Version: Windows 10, x64
Product Name/Version: Latest. Kidding. Halimede, 2.4.0.4
Problem Description:

I am running a master control panel server (Linux) with a seperate target (Linux). It works fine, and all games are launched and it works like a charm. Some Games require Windows. So I setup a new Windows 10 “Server” with fixed public IP (barebones) and Installed AMP on it.

I set it up as target and it registered in my control panel. Creating a game and deleting works.
But launching ANY game does not.

There is nothing in the logs, except

17:09:14
Authentication attempt for user AMP_SYSTEM from 10.100.124.35
Authentication success
Changing setting ADSModule.NewInstanceDefaults.DefaultAuthServerURL to http://gcp.myhost.com:8080/
17:09:24
Deleting instance cef8f9f6-f155-4a9d-8227-7653f82d3c01
17:09:44
Using cached archive: C:\AMPDatastore\Instances\AMPCache-2404.zip
17:11:01
Authentication attempt for user AMP_SYSTEM from 10.100.124.35
17:11:04
Authentication success
Changing setting ADSModule.NewInstanceDefaults.DefaultAuthServerURL to http://gcp.myhost.com:8080/
17:11:06
Waiting for AMP instance to start...
AMP instance Arrrmarr01 is now running.
17:12:00
Instance Arrrmarr01 has stopped.
:Christian17:12:41
Start for instance Arrrmarr01 was requested, but it is already running.
17:13:57
Waiting for AMP instance to start...
AMP instance Arrrmarr01 is now running.
17:14:00
Instance Arrrmarr01 has stopped.

Actions taken to resolve so far:

  • Doing the ampinst reset login,
  • Doing the re-integration/ setup again
  • Disabling the Windows Firewall alltogether (There is a dedicated real firewall before all servers)

Any help would be greatly appreciated.