SQL Server Report Services Not Configuring

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SQL-Server

SSRS

reporting

Ok this is kind of Frustrating... I think/know I am doing everything right... However SQL Server Reporting Services cannot be configured:

To Configure I did these following steps

Opened Reporting Services Configuration Manager
Click Connect
Clicked Web Services URL
Here (first) I just used the default values (just giving a different Name)
Then I tried to configure by using the Host Header
Clicked Advance Gave Host Header a Name from DNS something like (rs.constoso.com)
Removed "All assigned listener"
I Change the Database

Created a new report database
connected to database server
used both Sharepoint Mode (cause eventually that is what I am trying to do) and the native mode.
However no matter what I do the reporting service seems to not respond. When I click the Web Service URL it says the Reporting Service has some Error.

I am not sure what am I doing wrong (is there something I am forgetting somewhere?)

My System:

Windows Server 2008 R2
SQL server 2008
Has Sharepoint 2010 installed