Hello Gerhard,
Thank you for posting.
Form your post, I think your problem belongs to Single Sign-on Cross
Domains and Platforms. There have two cases, one is Single Sign-on Within a
Sub Domain, and the other is Single Sign-on Within a Second Level Domain.
The article below discusses the methodology and implementation of single
sign-on cross domains or platforms using ASP.NET Forms authentication in
conjunction with ASP.NET web services. It also discusses the methodology of
transferring user data to an application located at a different domain or
platform during the authentication process. Although being highly
simplified, it provides a good starting point for developing your own
single sign-on authentication solutions.
Please check the following link:
http://www.codeproject.com/KB/aspnet/SingleSignon.aspx
Please let me know if you have any other concerns, or need anything else.
--
Sincerely,
Roy Tian
Microsoft Online Support
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