unable to login to portal

Hi All,

I am trying to login to portal...

First page of the portal is getting displayed and when I enter the Username and Password I do not see any progress...

I see message " can not find server "

Portal server is up and running

I also restarted the server and also tried to login using Administrator user name

I am also unable to see the output of the web dynpro applications

Can anyone suggest me wht to do

Thanks in advance