...
Restart the Abiquo Tomcat Server
...
In versions prior to Abiquo 3.4, after you have made you changes restart the Tomcat server.
In Abiquo 3.4
...
and later versions, do not restart the Tomcat server because modifications will be applied within 60 seconds
...
After modifying the log files you must restart the Abiquo Tomcat Server for changes to take effect.