response.sendRedirect() not performing

[Harish Kashyap]

when my jsp page is processed and the time it processes the sendRedirect() method then my browser says
Cannot find server or DNS Error
Internet Explorer
my jsp engine doesn't throw any exception
i checked each and every step
its processing whole jsp except the last line i write
response.sendRecirect(url)
and a funny thing
when i refresh the screen the page is again processed and redirected to the desired location.