The fix has been published for 2.2.X series. The package is zentyal-users version 2.2.8
FYI, I applied this update this morning using Zentyal GUI
but my system became unresponsive
No more access to Zentyal GUI and slow access to internet
I tried to find what was wrong. Nothing special except maybe more error messages in /var/log/zentysal/error.log...
Well, I will have to look at this later but the urgent aspect was to ensure internet access was running smoothly. So I decided to reboot Zentyal server.
What a wrong idea
It took quite a lot of time before I could SSH and access GUI. Then no internet access. I was wondering why until I discovered that both my external interfaces were not enables in the /network/gateway menu