Changing the SSRS Port
The Port field in PR RS Server form holds the port number for the SQL Server Reporting Service, and defaults to 80.
Generally, you should not have to change the value in this field, but you can if necessary. If you do change the value in this field, then you must make sure that it matches the value in the TCP Port field on the Web Service URL tab of the Microsoft SQL Server Reporting Services Configuration Manager.
To change the value in the TCP Port field on the Reporting Services Configuration Manager: