My .net 3.5 web application giving runtime error on partially on some clients. Say client 1, application running fine smoothly. client 2, application running but some pages of application gives error 404 file not found. as these pages were working fine on client 1. For example there is record search page in my appllication on base of case number if i search on client 1, the record search is successfull and result displayed. if i search same record on client 2, the error page displays 404 file not found. For more information The application uses a small database having around 20,000 records. The problem occuring on very small number of client systems. What the actual problem can be and in what area?