Download Client not Downloading but test working fine

[hk21]

Sonarr version (exact version): 2.0.0.5338
Mono version (if Sonarr is not running on Windows): 5.20.1.34
OS: Unraid/Docker Container
Debug logs: https://pastebin.com/NhEHWETV
Description of issue: Some advice if possible, every download client I use, ‘Test’ works fine but when I try to actually add a torrent, it errors with:
Request Failed. POST /api/queue/grab: Unable to connect to rTorrent, please check your settings

This is when using ruTorrent and Deluge, the ‘Test’ works but when trying to add an actual torrent, it fails and also shows the download client as unavailible.

[Taloth]

For those reading in the future having the same issue: OP was having an issue with his router MTU being 1492, while the docker container sending 1500+ MTU frames and for some unknown reason getting dropped. (Remote rtorrent on seedbox)