SLD not working..says SLD not set up. Configure the SLD in Administration

IHi,

I login to my SLD , success..But then I see the message

SLD not set up. Configure the SLD in Administration

and on clicking the 'administration' link I see, red status with message , 'SLD not set up; perform initial setup first'. So I click the iniital setup link and I need to fill in these..

Object Server Name:

Gateway Hostname:

Gateway Port:

I dont have any idea on this ? Any help ?

Also will performing this iniital setup help me to start my SLD ? SLD was up and working fine till sometime back and when my SLDCHECK started failing, I noticed this..

pl suggest..

thnks