ASP.NET 1.1 and 2.0 on the same IIS 6.0

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I have a problem in ASP.NET 2.0 security the details are the
following :


1- I have two seperate applications one is ASP.NET 1.1 and the other
is ASP.NET 2.0
2- The Application of ASP.NET 2.0 is calling webservice on ASP.NET 1.1
and sometimes open it in a pop-up window.
3- When the ASP.NET 1.1 application is opened in pop-up , the
memebership class in ASP.NET 2.0 log out the user into the login page
again. (The login became invalid)


I think there is some thing happened in the session , i tried to put
them on two different IIS pools but this didn't solve the situation .
I used IIS 5.0 seperation mode but also it didn't solve it.


please ,can any one help ?

Thanks,