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It looks like you are using the Apache server and you have enabled the login whitelisting from Admin Dashboard > WP Security > Brute Force > Login Whitelist (tab) in the past. The login whitelisting feature was not working in the older AIOS version on such configured Apache servers. Starting from AIOS 5.0.8, it started working suddenly. You are trying a non-whitelisted IP address client, so you can’t browse the login screen and face the 403 error on it.
Solution: Please add the below code line in the wp-config.php file before /* Add any custom values between this line and the “stop editing” line. */:
define('AIOS_DISABLE_LOGIN_WHITELIST', true);
It will disable login whitelisting on your site.
Thanks a lot for reaching out to us.
Thanks for responding and explaining the occurence of the white page. I followed your recommendation and i am looking forward to see no more blank pages when logging into the backend.
Have a nice day – theo