Gateway shutdown

I have a site that is running an ignition gateway on a production server.
They also have a test server that has an ignition gateway.
The test server also has other apps that the customer needs to test from time to time.
If I use the Gateway Control Utility on the test server to shut down the gateway will it only shutdown the test server gateway or also shutdown the production server gateway?

Just the test server. The GCU only communicates locally.