ICM running but no server with HTTP connected

Hi all,

I have installed NWDS CE 7.1 in my system. I developed a sample Web dynpro application and when i deployed it, i am getting the following error

503 Service Not available

"ICM running but no server with HTTP connected"

What could be the reason for this?

In the SAP Management Console,the "server0" is always in Yellow color.I tried to restart, but it is always in yellow color.

Please guide me.

Regards,

Padmalatha.K