Zammad Proxy error Error reading from remote server

Hello,

I have the latest ups-4 and Zammad installed.

When I want to access Zammad via https://ucs:10412 I get Proxy error Error reading from remote server. Before the last updates everything run fine. So I had a look to the docker container.

From ucs

3b0d28970e58        docker.software-univention.de/zammad-zammad-nginx:3.6.0-42           "/docker-entrypoint.…"   24 minutes ago      Up 3 minutes        0.0.0.0:40001->80/tcp   zammad_zammad-nginx_1
4df7b9960845        docker.software-univention.de/zammad-zammad-scheduler:3.6.0-42       "/docker-entrypoint.…"   24 minutes ago      Up 3 minutes                                zammad_zammad-scheduler_1
e682de5fdbc9        docker.software-univention.de/zammad-zammad-backup:3.6.0-42          "/usr/local/bin/back…"   24 minutes ago      Up 3 minutes        5432/tcp                zammad_zammad-backup_1
8ca5c9220b35        docker.software-univention.de/zammad-zammad-websocket:3.6.0-42       "/docker-entrypoint.…"   24 minutes ago      Up 3 minutes                                zammad_zammad-websocket_1
81897790c2a3        docker.software-univention.de/zammad-zammad-railsserver:3.6.0-42     "/docker-entrypoint.…"   24 minutes ago      Up 3 minutes                                zammad_zammad-railsserver_1
e3f7344342b2        docker.software-univention.de/zammad-zammad-elasticsearch:3.6.0-42   "/tini -- /usr/local…"   24 minutes ago      Up 4 minutes        9200/tcp, 9300/tcp      zammad_zammad-elasticsearch_1
ddfb6fb0d7e2        docker.software-univention.de/zammad-zammad-postgresql:3.6.0-42      "docker-entrypoint.s…"   24 minutes ago      Up 4 minutes        5432/tcp                zammad_zammad-postgresql_1
3225fed5932e        docker.software-univention.de/zammad-zammad-memcached:3.6.0-42       "docker-entrypoint.s…"   24 minutes ago      Up 4 minutes        11211/tcp               zammad_zammad-memcached_1
curl http://127.0.0.1:40001
curl: (56) Recv failure: Die Verbindung wurde vom Kommunikationspartner zurückgesetzt

Inside the Zammad Nginx container:

curl http://127.0.0.1:80
<!DOCTYPE html>
<html>
...

So Nginx is running and should work. But the forwarding from ucs host port 40001 to container 80 is not working. I don’t find the problem. has anyone an idea what the problem could be?

Best regards,

Alexander

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