Asking User ID & Password after SSO configuration in Portal 7.31

Hii,

I configured SSO from SAP Portal 7.31 to R3 server.It is working but the problem is it is asking user ID & Password after logging.

After entering user id & password we are able to access the applications.

I checked complete SSO configuration but didn,t found solution for this issue.

Please help us to solve this issue.

Thanks,

Prabhat Mishra