Continuing the discussion from Fedora 31 and duplicati?:
Pulled this out of my previous topic where Duplicati still won’t install under Fedora 31 (and possibly other flavours), and see if anyone can help.
I use the SSL certificate options with Duplicati (currently running 126.96.36.199_canary_2020-02-18), and it was fine until I upgraded from Fedora 30 to 31. After overcoming the install issue I now hit a problem where the service crashes when I try to access the web GUI when HTTPS is enabled. Removing the service options to include a certificate and reverting to HTTP allows me access again. Backup appear to be unaffected though I need to check the logs later today.
I did find this bug report Mono 188.8.131.52 / httpcfg on Linux fails with "Operation is not supported on this platform." · Issue #14152 · mono/mono · GitHub which is a similar issue, with Mono being broken and possibly fixed just not released at the time.
It’s all beyond what I understand with Linux/Mono so maybe one of the more knowledgeable persons on this forum can make sense of it.