Better messaging around local server conflicts
Improve this, perhaps with some message about how to open the servers view and stop the existing server; or even a dialog that asks whether to stop the existing server.

Are there other solutions besides checking the server view, stopping the server view, or manually killing the Python dev server process? See the attached images - the server is stopped, nothing is listening on port 8080 or port 8000, yet Eclipse (Mars 4.5.2) still gives this "Conflicts with running server..." message. Nothing's running but Eclipse refuses to launch the App Engine Standard dev server. A restart of Eclipse does seem to clear the issue.



Alternately, perhaps we can pick random unoccupied ports so we can launch multiple servers at a time?