Get "Unable to retrieve queue and history items from NZBGet" error after updating

[clueless]

Sonarr version (exact version):
2.0.0.5163

Mono version (if Sonarr is not running on Windows): 5.8.0.108
OS: Synology DSM 5.0-4482
Debug logs:
https://pastebin.com/uUykf6hJ

Description of issue:
Since updating the Mono and NZBGet packages I now get this error in my logs.

Can anyone help me resolve this?

Thanks

[markus101]

This was introduced in a mono update, either 4.6 or 4.8 and has yet to be fixed as of mono 5.10 as far as I’ve seen.

[clueless]

Can you elaborate what the issue is? what the impact is and if there are any work arounds?

[Taloth]

@markus101 The link you posted on hangouts might still apply. I followed a couple of convos on the mono github and although we don’t use HttpClient directly the behavior seems quite the same https://github.com/mono/mono/issues/7094
HOWEVER, the thing is that the exception would still occur after the fix, it’d just be a different one. My guess it’d be a timeout or nameresolution exception. So at this point we don’t know whether the issue is caused by nzbget, mono or a combination.