Website is not available: 500 Internal server error: Error Code 0xc0000005

Symptoms

• A website is not available with the following error:

  CONFIG_TEXT: 500 Internal Server Error
  C:\Parallels\Plesk\Additional\PleskPHP5\php-cgi.exe - The FastCGI process exited unexpectedly

• The following error can be found in the Event Viewer:

  CONFIG_TEXT: Faulting application name: php-cgi.exe, version: 5.2.17.17, time stamp: 0x4d25fc25
  Faulting module name: ntdll.dll, version: 6.1.7601.17514, time stamp: 0x4ce7ba58
  Exception code: 0xc0000005
  Fault offset: 0x00042092
  Faulting process id: 0x4550
  Faulting application start time: 0x01d2945ec1adafde
  Faulting application path: C:\Parallels\Plesk\Additional\PleskPHP5\php-cgi.exe
  Faulting module path: C:\Windows\SysWOW64\ntdll.dll
  Report Id: 08320fbd-0052-11e7-b831-00ffd710dc08

• A lot of domains are assigned to the same application pool in IIS > Applications Pools.

Cause

Too many domains assigned to one application pool.

Resolution

1. Log into Plesk;
2. Go to Domains > example.com > Dedicated IIS Application Pool for Website;
3. Press Enable.