Hi @ConorGrocock,
Thanks for your interest in Traefik.
Gateway timeout happens when Traefik is not able to communicate with your service.
Looking at your configuration, it seems you are using several networks on APM. When using 2 or more networks on a container, Traefik doesn't know which network to use. You have to help by providing him a network to work on.
Try to add this label to your traefik container:
- --providers.docker.network=elk
// or
- --providers.docker.network=application
EDIT: This is a link to the documentation Traefik Docker Documentation - Traefik