What did I do wrong? And how can I repair it?
Wrong ? For sure modifying /etc/network/interface content manually
The idea with Zentyal is that Zentyal manages configuration files. It relies on templates. If you need to apply changes, do it following
this documentation even if I don't think this one will solve problem you are currently facing.
I'm always surprised with the amount of Zentyal users manually changing settings first in config files when they face problem while they decide, on the other hand, to go for Zentyal. I though, but I'm obviously wrong, that one of the main reason for deploying Zentyal, compared to manual service management, was to benefit from some consistency and configuration easiness thank to user graphic interface.
What I suggest is that you launch Zentyal GUI (locally if you can't access it from you LAN) and check configuration.
Then look at log files and also try to determine error root cause before applying fix, still using first GUI. Manual config change should be, from my standpoint,t he very last choice.
