I have asp.net web application which is ruing fine.
After login and redirect to default.aspx page, I could do the regular nevigation.
However, onece I rebuild default.aspx page and tried to do the same nevigation to other page,
it redirected me to login page over and over again.
So I logined in again and I could be the same nevigation with new default.aspx page.
Wheverver I changed the default.aspx page, I had to login again and again.
I tested with Visual studio.net debug mode to try to trace. Code wise, nothing I could catch during the debug rather than redirect me to login page. It supported to go to next.aspx page but login.aspx page.
I only successed very first time after build default.aspx page. After I rebuild default.aspx, I should relogin. I don't know why.