Sonarr version (exact version): 4.0.12.2823
Mono version (if Sonarr is not running on Windows):
OS: Ubuntu Server 24.04 with Docker
Description of issue: I have just setup a Ngixi Reverse Proxy for some of my local and external applications like Home Assistant, Plex, Radarr and ofc Sonarr.
All of them including Radarr are working perfectly fine but connecting to Sonarr via the proxy takes a long time to load and usually fails or times out and also causes connecting via local IP to do the same until I then restart the docker container.
As I said, Radarr and Prowlarr with the identical configuration has no issue, only Sonarr is showing this. I have seen others with similar issues but no clear fix.
Edit: I have them setup like app.xxx.com so sonarr.example.com and local DNS resolves it to the NPM IP