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

Symptoms

• A website is not available with the following error:

  500 Internal Server Error
   C:ParallelsPleskAdditionalPleskPHP5php-cgi.exe - The FastCGI process exited unexpectedly

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

  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 path: C:ParallelsPleskAdditionalPleskPHP5php-cgi.exe
   Faulting module path: C:WindowsSysWOW64ntdll.dll

• 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.