IIS Login prompt

I have a php application that is running on IIS (accessed from IE) and I want to use windows authentication for the site, where user's logins are detected from their current windows logon.
I have disabled 'Anonymous'  and enabled 'Windows Authentication' and the users get prompted and can get in once they enter theri windows credentials BUT according to what I have read they should not be prompted because the website is is the same domain it appears in the 'Intranet Zone'.
What do I need to do to get rid of the windows loging prompt on a windows authentication enabled website?
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If the IIS server is a domain member and you have Windows Authentication, and the client workstation you are accessing the site is in the same domain as the IIS server you won't get a prompt in IE.
I would check if everything is really setup as mentioned.

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If you access the web site with the windows hostname only (i.e. http://servername/) instead of the fully qualified domain name (e.g http://www.domainname.com) then you shoould get in without the prompt.

Alw1nAuthor Commented:
I am still not sure what the problem was here as it is all working now. One thing I did notice is that the URL must definitely be in the intranet zone to avoid the prompt.
Not sure how to award this so I split the points - thanks for your input.
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Microsoft IIS Web Server

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