Cannot connect to SQL Report Server through web as well as management studio (Http:503 error Ser

hi all,
i have SQL 2205 with SP1 installed on my machine.
and i m not bale to connect to Report Server using SQL management studio as well as from web.

i have installed reporting server and database on same machine. i tried using

"http://localhost/reportserver"
"http://localhost/reports"
"http://localhost/reportmanager"

but i am not bale to connect i am getting "Service Unavailable" page.

and when i try to connect using SQL Management Studio with "servername/instance" as well as "http://localhost/reportserver" i am getting a error saying.

===================================
Cannot connect to http://localhost/reportserver.

The request failed with HTTP status 503: Service Unavailable. (Microsoft.SqlServer.Management.UI.RSClient)

===================================

but if i try and connect to other reporting server on other machine using web http://servername/reportserver i m able to connect it.
but dont know whats the problem on my machine.

do i need to start any services for this...

so anybody knows how to troubleshoot this issue.

Thanks in advance...

This thread may help.

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=998654&SiteID=1