[BUG] Unable to edit some files with File Manager in Plesk via HTTPS: file loads indefinitely

Symptoms

• Files like .htaccess or wp-config.php cannot be opened nor edited in Plesk File Manager via CodeEditor. They just keep loading:

  

• Going to Tools & Settings > Web Application Firewall (ModSecurity) > Web application firewall mode is set to On

• Nginx is uninstalled, disabled, or its service is not running:

  # plesk sbin nginxmng –status
  Disabled

  # plesk sbin nginxmng –status
  Error: Nginx component is not installed.

Cause

Product issue:

• #PPPM-12921 “Cannot open wp-config in CodeEditor on the server without Nginx and with enabled ModSecurity”, which is scheduled to be fixed in the upcoming versions of Plesk.

Resolution

As a workaround, apply one of the following steps:

• Access Plesk with a domain and port (8443)

• Disable the ModSecurity ruleset IDs blocking the requests

• Disable ModSecurity at Tools & Settings > Web Application Firewall (ModSecurity) > Web application firewall mode.

• Enable Nginx as a Proxy