Google 2 factor authentication fails randomly
Invalid Google Authenticator code. Make sure the time is correct on the server and the mobile device.
The server time is incorrect. The time on the server needs to be synchronized with a time server. Even, if the time on the server has an offset of 5-10 seconds, the google 2factor authentication would have random failures.
Use the command to correct the server time.
root@gateway ~]# ntpdate pool.ntp.org
Also, do ensure the time on your mobile phone is correct as well. Sync the time on your mobile with that your mobile operator to ensure that time is accurate.
Google Authenticator -> Settings ->Time correction for codes -> Sync now
The battery on the motherboard could be weak or failing which may cause the server time to fall behind a few seconds. It's recommended to keep the above command added as a cronjob.
Run the below commands to disable and clear google authenticator.
root@gateway ~]# php /usr/local/ezlogin/ez_queryrunner.php "update prefix_settings set value='N' where(name='enable_google_authenticator')"
root@gateway ~]# php /usr/local/ezlogin/ez_queryrunner.php "update prefix_users set egs=NULL where username='ezadmin'"
Refer below article to disable the two-factor authentication form backend.