i do have a game firewall but that is not the problem here, i did forward the ports for the conan server in there.
But it does allows all(any) ports for the executable TCAdmin adds to the firewall, it does not add the ports to the windows firewall.
So if the TCAdmin executable for conan is ConanSandboxServer.exe then it opens any port for ConanSandboxServer.exe. The problem is that ConanSandboxServer.exe starts another executable wich is ConanSandbox\Binaries\Win64\ConanSandboxServer-Win64-Test.exe wich actually runs the server, but TCAdmin does not add ConanSandboxServer-Win64-Test.exe to windows firewall.