In WordPress, the plugin is installed and works well, but when changing options and saving, there is no permission. 'You do not have sufficient permissions to access this page.' A message may appear.
In my case, not all plugins have this problem, and it seems to happen when there is a setting option, so it is changed and saved.
This problem occurs because the Apache version is set to Microsoft-IIS in the case of Linux-based hosting for security reasons at the Korean hosting company. A problem that occurs because WordPress recognizes the server environment as IIS instead of Apache.It is said
If you add the source code below to wp-config.php in the WordPress installation folder, it works normally.
$_SERVER['SERVER_SOFTWARE'] = 'Apache';
Even though my WordPress is the latest version 4.4.2, it seems that the problem recorded in 2009 is still occurring. It is a bit reluctant to do this for security reasons, but I think it would be good to find a fundamental solution.