Starting multiple applications in photon control

Hello,
I have separated login and game logic into 2 different servers and i want to start one login server and one game logic server on the same machine.

But when I start my logic server and than try to start the game logic server, the "Start as application" button is inactive and cannot be pressed.
Only when i stop the logic server, the button is active again.

How can I start both applications on the same machine?