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Just found this actually which should do it <a href="http://weblogs.asp.net/hernandl/archive/2004/06/09/ssoformsauth.aspx" rel="ugc">http://weblogs.asp.net/hernandl/archive/2004/06/09/ssoformsauth.aspx</a>
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Just found this actually which should do it http://weblogs.asp.net/hernandl/archive/2004/06/09/ssoformsauth.aspx [http://weblogs.asp.net/hernandl/archive/2004/06/09/ssoformsauth.aspx]

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Who when a user signs in can I create an FormsAuthenticationTicket which is valid across multiple domains<br />
e.g.<br />
User signs into <a href="http://www.somesite.com" rel="ugc">http://www.somesite.com</a>&nbsp;and in doing so I also want them to sign in to <a href="http://www.someothersite.com" rel="ugc">http://www.someothersite.com</a><br />
Thanks
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Who when a user signs in can I create an FormsAuthenticationTicket which is valid across multiple domains
e.g.
User signs into http://www.somesite.com and in doing so I also want them to sign in to http://www.someothersite.com
Thanks

FormsAuthentication across multiple domains

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications