Configure Report Server Initialization Problem (SQL 2005) Seeking for expert

I setup Report Server Virtual Directory, Report Manager Virtual Directory,
Windows Service identity, Web service identity, database setup, they all
working fine. When I click on [Inititialization] I get this error
----
Reporting Services Configuration Manager
--
There was an error while switching panels. The most likely cause is an error
retrieving WMI properties. The exception details are:
An error occurred when attempting to connect to the report server remote
procedure call (RPC) end point. Verify that the Report Server Windows
service is running, and then retry the operation.
Details:
The RPC server is not listening. (Exception from HRESULT: 0x800706B3)
-----
Experts, please help me out, I'm stuck. Thank you very much!Server Status and Initialization has (x) on it, should initiazation solve
first or make server running first?
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>I setup Report Server Virtual Directory, Report Manager Virtual Directory,
>Windows Service identity, Web service identity, database setup, they all
>working fine. When I click on [Inititialization] I get this error
> ----
> Reporting Services Configuration Manager
> --
> There was an error while switching panels. The most likely cause is an
> error retrieving WMI properties. The exception details are:
> An error occurred when attempting to connect to the report server remote
> procedure call (RPC) end point. Verify that the Report Server Windows
> service is running, and then retry the operation.
> Details:
> The RPC server is not listening. (Exception from HRESULT: 0x800706B3)
> -----
> Experts, please help me out, I'm stuck. Thank you very much!
>