I've been running SABnzbd in Docker, on a Synology DS218+, for several years and have had no issues. This morning I updated (I think from 3.7.2) to 4.0.2 and it's now not working at all. If I try and log in via the web interface, I just "The connection was reset" as an error. But it can't just be just the web interface, as Radarr is reporting "All download clients are unavailable due to failures". So it seems to not be working at all.
I've had a look at the changelogs, but I can't see anything obvious. Was there anything I should have done, before upgrading to v4.x?
I performed the update as I always have, getting the latest, from linuxserver, via Docker's interface. I also tried using SSH to do a pull request, but it said that it was up to date.
I tried stopping SABnzbd, deleting the .ini and restarting, but that made no difference.
Is there something really obvious that I've missed? I set Docker up a while ago and only touch it for updates, so I'm by no means an expert!
Many thanks.

