CGI processes do not start

If your CGI processes do not run, ensure that the CGI Web service extension has been enabled. See Requests for dynamic content return 404 error . Also, CGIs will not start unless the account on which the CGI processes run are assigned certain user rights. You can add the account as a member of the IIS_WPG group and assign the account the following two user rights:

If you use anonymous authentication and you call external programs, including PHP programs, from CGI code, the operation may fail. The failure occurs because in IIS 6.0 the default anonymous user account, IUSR_Computername, is explicitly denied access to all executable programs in the %windir%\System32 folder for security reasons. To resolve this problem, remove the IUSR denial access control list (ACL) on the appropriate command-line tools that reside in the %windir%\System32 folder, and grant the IUSR_Computername account Read & Execute access.