Swag Docker config example for jellyfin?

[TheDreadPirate]

Code:

location ~ (/jellyfin)?/socket/ {

Is this what you actually have in the SWAG config? It should be

Code:

location ~ (/socket/ {

Also, in your DNS is "jellyfin" resolving to your jellyfin server? Try putting your container/host IP instead of "jellyfin" for the proxy pass.