Microsoft just changed their CDN url because of this: http://www.asp.net/ajaxlibrary/cdn.ashx http://www.asp.net/ajaxlibrary/cdn.ashx Though for the most part,

Microsoft just changed their CDN url because of this: http://www.asp.net/ajaxlibrary/cdn.ashx http://www.asp.net/ajaxlibrary/cdn.ashx Though for the most part, people will not have cookies set on the domain unless they have visited the main site (i.e. they are developers).