Blynk Server with Traefik as a proxy

Hey together!

I am trying to get the blynk server running via docker and behind traefik as a proxy. Traefik is runnig fine and blynk also running mostly fine.
If I connect to host:80 (http) I got internally forwarded to :8080 and then redirected to blynk.cc
If I connect to host:443 (https) I got internally forwarded to :9443 and then I run into the following error:
15:32:23.854 DEBUG- Unsecured connection attempt or not supported protocol. Channel : /172.18.0.3:49556. Reason : javax.net.ssl.SSLHandshakeException: error:1000009c:SSL routines:OPENSSL_internal:HTTP_REQUEST
15:32:23.954 DEBUG- Unsecured connection attempt or not supported protocol. Channel : /172.18.0.3:49558. Reason : javax.net.ssl.SSLHandshakeException: error:1000009c:SSL routines:OPENSSL_internal:HTTP_REQUEST

The port for the blynk docker is 9443 and dynamically for the host system and traefik should forward it automatically. Sadly I run into the error above. If I grab the docker port known for the host and attach it to the url I can connect to the admin panel.

So maybe someone knows why its not working with dynamic host port for me?

That you in advance!

Julsen