I’ve been having issues with my website recently where unexpectedly requests would stop making it through the reverse proxy to the application. I would SSH in to try and figure out what was going on and then it would start working again.
I think I stumbled on the problem this morning when I went to check that my user was still enabled to linger (https://serverfault.com/a/849280), and my user wasn’t listed?? I’m not sure what would cause it to disable like that…