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Knowledge Base

Plesk site on shared applicationPool shows error 500: The FastCGI process exited unexpectedly

 
domainsfastcgihttpinternal server errorplesk for windows

Symptoms

  • The website example.com is unavailable with the error message:

    HTTP Error 500.0 - external Server Error
    C:Program Files (x86)PleskAdditionalPleskPHP70php-cgi.exe - The FastCGI process exited unexpectedly

  • More than one site is using shared application pool "plesk(default)(4.0)(pool)" at Windows > Server Manager > Tools > IIS Manager > hostname > Application Pools > plesk(default)(4.0)(pool) > View Applications. 

Cause

Domains with different ASP.NET versions use shared application pool.

Resolution

  1. Log into Plesk.
  2. Enable dedicated application pool for both websites in Domains > example.com > Dedicated IIS Application Pool for Website > Switch On.
  3. Disable it again in Domains > example.com > Dedicated IIS Application Pool for Website > Switch Off.
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