Which user identity is using php with Windows Authentication ?

Hi,I'm giving ACL File permissions to my windows domain user to write in some directories of the website, however I'm getting denied access erros from the php scripts that writes to these dirsI understood from this linkhttp://www.iis.net/learn/get-started/planning-for-security/secure-content-in-iis-through-file-system-acls, that using Windows Authentication, the PHP script will run under the authenticated user identity, in my case my windows domain user, what I'm doing wrong ?Kind RegardsLazaro