Like an earlier poster, I found today that I can't access the delugevpn webUI - it just times out. Nothing has been changed at this end at all, so it's a mystery. Docker seems to start and stop fine, according to the logs, but no other apps are able to access deluge.
UPDATE: following a tip from @Tomahawk51 below, I checked VPN settings and also local IP address, reset them all - and deluge is working again. So that's all good then! Problem solved.