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I am getting this error/warning PHP exec(): unable to fork ["command I plan on running"] when attempting to run the exec() within a PHP script. It is running on an IIS server. I have attempted the following:

  • Changing Authentication settings on IIS server for web site
  • giving read/write access to relevant users on cmd.exe
  • Scanned the php.ini file for any disables for exec() function

I am running out of clues as to why this error is occurring. versions of the same script are working well on other VMs.

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Reset to default
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Please check these 2 locations:

(1) Application Pool > Advanced Settings > Process Model > Identity

This should be set to a domain user.

(2) Web site > Authentication > Anonymous Authentication This should be set to the same "Specific user" as the application pool (in 1 above).

After (1) and (2) above, please try running exec() in IIS again (please remember to restart the IIS service before you retry)

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my App requires Basic and Windows Authentication so I have Anonymous Authentication disabled. Is there any solution without changing these settings?
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https://www.itdroplets.com/iis-php-and-windows-authentication-run-as-a-service-account/

In Section (1), go to system.webServer/serverRuntime and change authenticatedUserOverride from UseAuthenticatedUser to UseWorkerProcessUser (2). Make sure you click on Apply.

Dropping this here so when I forget in the future I can look it up again. This is what resolved the issue for me. :)

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