Hello eveybody,
I am currently trying to run brwoser bots to test an experiment. Currently, however, I am getting the following error:

requests.packages.urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='127.0.0.1', port=8000): Max retries exceeded with url: /close_browser_bots_session (Caused by NewConnectionError('<requests.packages.
urllib3.connection.HTTPConnection object at 0x058B3310>: Failed to establish a new connection: [WinError 10061] Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte'))

Which seems to indicate that the bots repeatedly try and fail to get a connection. The last line in German states that "a connection could not be established, as the target computer refused the connection." 

I did a bit of searching online, but most discussion of this error went deeper that I am familiar with. Has anybody experienced this error before or knows which kind of setting might cause it?

I use otree 5.9.6, Google Chrome is installed, and I reduced the tests down to the bare minimum (simply yielding the first introduction page).

are you running the server?

Sometime, it's the small things. That was indeed the problem, it wasn't running anymore :D
Thanks