SQL 2005 - Service Unavailable when Accessing ReportServer - UNRESOLVED

Hi All,

I attempted to migrate the RDL files from SQL 2005 Reporting Services to SQL 2014 Reporting Services using ReportSync tool. However, when I try opening http://SQL2005/ReportServer I receive an error:Service Unavailable.

1. The SQL 2005 Reporting Services are running on the SQL2005 server
2. SQL 2005 SSRS successfully serve SCCM 2007 which is installed on the same server http://SQL2005/SMSReporting_AAA/

Question:

1. What is the functioning address of the SQL 2005 ReportServer in order to populate the ReportSync tool?

Many thanks, in advance!