ASP.NET, IIS application hosting

Question

hi,
I have developed an asp.net website and I hosted it on windows server 2008-R2 Enterprise which is having IIS version 7.5.
When the user logged in successfully I am redirecting the user to Page1.aspx .In page1 I am collecting some inputs from the user and on form submit I am redirecting them to Page2.aspx.
<b>"But it is not getting redirected to page2.aspx ,instead it's again going to login page".</b>

It is working fine in the following scenarios:
1.I hosted my application in another machine which is having windows server 2008 with the same IIS version(7.5).
2.In WINDOWS7 ultimate also it's working fine(same IIS version).
3.It is working fine in development with out any exception

Can anybody help me to solve this issue.

thanks and regards
Arun.