Firewall issue with running multiple containers after upgrade

Installation
11

As far as I’m aware the containers themselves are all ‘standard’ (so I gather each is running nginx) and yes, HAProxy handles all of the SSL and directs requests to each container.

My set-up is per the write-up here: Set up Discourse on a server with existing Apache sites (with the SSL version of the HAProxy configuration here).

There was one issue with the HAProxy config:

backend main_apache_sites
  server server1 127.0.0.1:8080 cookie A check
  cookie JSESSIONID prefix nocache

backend discourse_docker
  server server2 127.0.0.1:8888 cookie A check
  cookie JSESSIONID prefix nocache

backend discourse_docker_2
  server server2 127.0.0.1:8889 cookie A check
  cookie JSESSIONID prefix nocache

backend discourse_docker_3
  server server2 127.0.0.1:8890 cookie A check
  cookie JSESSIONID prefix nocache

backend letsencrypt-backend
  server letsencrypt 127.0.0.1:54321

Where for some reason all of the discourse backends had server2 on the second line - I changed these to server2, server3 yesterday, etc but it’s not made any difference (and it was working fine like this previously).

Are there are specific log files I could look at that might provide further clues? Perhaps Docker log files?

Yes those are commented out:

templates:
  - "templates/postgres.template.yml"
  - "templates/redis.template.yml"
  - "templates/web.template.yml"
  - "templates/web.ratelimited.template.yml"
## Uncomment these two lines if you wish to add Lets Encrypt (https)
  #- "templates/web.ssl.template.yml"
  #- "templates/web.letsencrypt.ssl.template.yml"
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