Relay Server Unreachable

I have a relay server with test agents running that I frequently run tests from, however lately I’ve been seeing ‘Server Unreachable’ after the test has finished executing. I can RDP into the test agent and see the test running but when it’s time for the data to come back the web server reports back ‘Server Unreachable’ despite the relay server having already ran the test. Has anyone else run into this? Thanks for reading!