$ sudo systemctl status duplicati
● duplicati.service - Duplicati web-server
Loaded: loaded (/lib/systemd/system/duplicati.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2021-02-15 07:09:28 EST; 10min ago
Main PID: 798 (mono)
Tasks: 15 (limit: 19054)
Memory: 71.3M
CGroup: /system.slice/duplicati.service
├─ 798 DuplicatiServer /usr/lib/duplicati/Duplicati.Server.exe --webservice-port=8200 --webservice-listen-interface=any
└─1164 /usr/bin/mono-sgen /usr/lib/duplicati/Duplicati.Server.exe --webservice-port=8200 --webservice-listen-interface=any
Feb 15 07:09:28 plexhp systemd[1]: Started Duplicati web-server.
So that seems OK.
Plex is running on the same server and connects happily on port 32400
UFW is disabled.
I have tried connecting by servername and by IP address with the same result
From my desk:
$ telnet frier-hp-server 8200
Trying 10.25.1.18...
telnet: Unable to connect to remote host: Connection refused
Banging head on desk.
Please indicate where I am being an idiot.