Using forms authentication, how do I handle redirection to a different subdomaim

I have multiple sub-domains that use forms authentication. Once a user logs in, they are fine going to any of the other sub-domains.

Here is my problem: If I go to reporting.example.com/reporting.aspx, I get redirected to login.example.com/login.aspx. After entering my credentials, I get redirected to login.example.com/reporting.aspx, which doesn't exist.

I have a work around but I would like to know if there is a cleaner way. What I do currently is set the loginUrl attribute of the forms element of the reporting.example.com to be login.example.com/login.aspx?domain=reporting.example.com.

Then, in the login.aspx code, a开发者_开发知识库fter I've authenticated and set the cookie, I look to see if there was a domain variable passed in to the URL. If so, I prepend the returnUrl with the domain and do a simple redirect.

It works, but it feels klugey. Any ideas?

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Does the ReturnURL contain the full url? If so it should work as expected..

Make sure you have EnableCrossAppRedirects set to true in your web.config.