Sites are not accessible: Error HTTP 500.0 - Internal Server Error

Symptoms

• Trying to access a domain website shows the following error:

  PLESK_INFO: HTTP Error 500.0 - Internal Server Error
  C:\Program Files\Parallels\Plesk\Additional\PleskPHP72\php-cgi.exe - The FastCGI process exited unexpectedly
  
  Detailed Error Information:
  Module FastCgiModule
  Notification ExecuteRequestHandler
  Handler PHP-php
  Error Code 0xfffffffe
  Requested URL https://example.com:443/index.php
  Physical Path C:\Inetpub\vhosts\example.com\httpdocs\index.php

• Repairing the permissions for the C:\Windows\Temp directory does not resolve the issue:

  C:\> C:\Users\Administrador>plesk repair --directory-permissions -directory "C:\Windows\Temp"
  Permissions were fixed for directory "C:\Windows\Temp"

• Disabling OPcache module in Tools & Settings > PHP settings for the php version reported by the error, allows the sites to work again:

  

Cause

One or more necessary cache files in C:\Windows\Temp are corrupted

Resolution

1. Connect to the server using RDP.

2. Navigate to C:\Windows\Temp

3. Clean the directory

4. Restart IIS

   C:\> C:\>iisreset