You must debug the issue by analyzing the following log files:
- /var/log/zentyal/zentyal.log
- /var/log/syslog
- /var/log/auth.log
- /var/log/zentyal/access.log
- /var/log/zentyal/error.log
- /var/log/nginx/error.log
Also, I recommend you to enable the debug module as follows:
1. Edit the parameter debug in the log file /etc/zentyal/zentyal.conf
2. Restart the webadmin module to apply the changes.
Finally, did you confirm that the services that manage the webadmin are running?
sudo systemctl status zentyal.webadmin-nginx zentyal.webadmin-uwsgi
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