Some times All the data should be show as Null in JobPortal

Question

Hello Guys.

I have one Development issue comes in jobportal.

Job Portal developed in VS2008 and Sql Server 2008

This portal is now running on Server but some times in this all the data of users show null so, user can't logged in and can't doing any thing in this.

I m using stored procedure to fetch the data from sql database

Reply me asap..

Thanks.....