Failed to log in invalid session

[HyperNinjaProX]

I can't get the proxy to connect to the upstream server. I changed the port on the server to a custom port 12345. Ran the script on port 12345 it showed up but it says invalid session. I changed the online mode to false on the upstream server the proxy and upstream is running on the same device. I can connect to the server without proxy server with the custom port but not through proxy. I can't figure out why it is not working. This may seem a bit stupid since i am not very technical and trying to figure out how all of these stuff piece together