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Currently on my SharePoint 2010 install the My Sites section is roped off on a sub-domain (port 80) of the main site collection. Whenever anyone opens the main site it automatically detects their username through AD and logs them in without prompting them. If they try to enter the My Sites sub-domain they are prompted to enter their username and password.

How do I get the My Sites site collection to act like the main site collection in regards to user credentials?

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up vote 7 down vote accepted

Most likely it is because the browser is not detecting that the subsite is in the proper domain. in IE, this is accomplished by making sure that everything that is * is in the "Local Intranet" zone, which is usually done via Policy. It can also be done manually by going to Tools-Options-Internet settings-Security-Local Intranet-Sites-Advanced

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What steps can I take to change this with Central Administration? – newuser Apr 26 '11 at 15:14
That is not really a Central Administration issue as the passing or ignoring of credentials is a decision made by the browser itself. In Central Admin, all you can do is ensure that you are using Windows Authentication for the site, which you are apparently already doing. – Dave Wise Apr 26 '11 at 15:20
So do I have to use GP to set the browsers for every employee to work properly? – newuser Apr 26 '11 at 15:31
That is what most companies do. Just make sure to use the wildcard (i.e. * so that you don't have to update the policy for every subsite. If you have a higher level domain structure, like, then set the policy to put * in the Intranet Zone. Whichever makes the most sense for your organization. – Dave Wise Apr 26 '11 at 15:35
WRT Mapped drives: It depends on what your OS is. If you're running Windows Vista or Windows 7, see Putting in the required registry info fixed the credential prompting for us. Windows XP users were never prompted for their credentials for mapped drives. – Evan M. Apr 26 '11 at 17:41

The simplest way I would go for it is implementing Kerberos. That, combined with browser settings to enable "Intranet Token caching" should do it for you in a blink.

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