The error occurs because the SQL Server Reporting Services(SSRS) server is configured to accept connections only via HTTPS.
Update the RSReportServer.config file using the following steps:
1. In Windows Explorer, locate the ReportServer directory. The following path is the default path of this directory: C:\Program Files\Microsoft SQL Server\MSRS10.MSSQLSERVER\Reporting Services\ReportServer
2. Right-click RSReportServer.config, click Open With, click Notepad and then click OK.
3. Locate the following Add Key entry: <Add Key="SecureConnectionLevel" Value="2"/>
4. Change the Value setting from 2 to 0.
See also http://support.microsoft.com/kb/2011889
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Note: We provide links to third-party websites in an effort to help you resolve your issue. We are not responsible for the information on third-party websites, and we cannot assist with implementing resolutions from these websites.