Lost Network connection


  • Used Zammad version: 5.0.x
  • Used Zammad installation type: package
  • Operating system: Debian 10
  • Browser + version: Chrome Version 96.0.4664.45

Expected behavior:

  • Zammad should work normally

Actual behavior:

  • after 5-10 minutes the message appears: “network connection lost” " trying to reconnect" and only after a few minutes my Server is reachable again via http

Steps to reproduce the behavior:

  1. Installing my Debian 10 + apache2 mariadb and elasticsearch
  2. Enable apache2, mariadb…
  3. All the above tools are active before and during the failure!!! (systemctl status …)
  4. Connection via http in the web browser
  5. After some time the message “Lost network connection” appears and Zammad (!) is no longer reachable
    → I can ping my Debian without any problems
    → I can access via SSH

on the Internet you can find generally nothing about this problem!

Server Infos:
16 GB Hard disk space
8 CPUs

Does anyone know what this could be and how to solve it?

So if this happens the Zammad service is still listening to network?
What happens if you reload the page?
What about your systems load… what does your production.log tell?

You may also want to have a look at performance tunings:

Right now it’s unknown what kind of load your system has and how regulary it appears.
This is why we most likely won’t be able to help you at all I’m afraid.

I solved the problem myself.
I had configured the wrong subnet mask

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