Sudden 504 errors on new service image builds

Image Builds
1

Hi.

Since yesterday, we experience problems with newly built images (Dockerfile unchanged).
Everything worked perfectly well until yesterday. All new images show timeouts.
The same stack runs locally with the same settings using Docker compose without any problems.

  1. Request is received by an nginx proxy on 443.
  2. Request is forwarded to a linked API nodejs service on port 83
  3. I see a request in the API service log when I cancel the request or it times out with a 504.
  4. Older images deploy and work withing a stack without issues
  5. API is linked to a proxy using compose links (in the stackfile).

Even images built from older branches show the same behaviour.
Any idea?

Thanks!