Create an mnet connection with another instance of moodle ( http://docs.moodle.org/27/en/MNet ) Go to [Site administration ► Networking ► Peers ► {other moodle instance} ] and check that there is no log tab on the administration screen. grep for refresh_log() and make sure that there are no entries, besides the actual function and the debugging call (grep -r -n 'refresh_log(' .). Branches 2.6 and 2.7 Create an mnet connection with another instance of moodle ( http://docs.moodle.org/27/en/MNet ). Go to [Site administration ► Networking ► Peers ► Client moodle site] and click on the logs tab. Check that you get a notice saying that you may not receive logs from Moodle sites running 2.7 or higher. All branches Go to [Site administration ► Reports ► Logs] and check that you don't get a notice about mnet logs (unless you specifically choose an mnet connection which is 2.6 only). Please note in 2.6 that there are a lot of notices and warnings when viewing the log page. This has been reported in https://tracker.moodle.org/browse/MDL-36642