Have you tried accessing your service url from inside the Traefik container? Eg. wget https://10.13.16.1? Also you seem to be accessing the service url with https, which usually requires insecureSkipVerify=true. Otherwise you might get http-500 error downstream.

How about the Traefik access logs (separate from the main log), do they reveal anything?

Just a few thoughts:

• Did you enable access logs in Traefik as well as setting global log level to debug? This usually gives a lot more info about whats going on
• Are the containers using the same docker network or host network, so they can reach each other?

This. My friend had a triple stroke shortly after having neck manipulation done by a standin for his usual chiropractor. Luckily he survived, but it has very much opened my eyes to how dangerous it can be.