Reporting Web service proxy Does
not exist in the farm
Issue: After we
configure Everything related to Reporting services for SharePoint 2013,when we
try to create the reporting service application in CA, we encounter the issue “Reporting Web service proxy Does not exist in the farm”
Cause: The issue is due
to the reporting features are installed but not configured the reporting
services and the proxy in CA.
Solution: Ensure to run the below commands to get rid of the
error.we must run the below two commands before creating the SSRS service application in CA.
Install-SPRSService
Install-SPRSServiceProxy
You can find the very detailed explanation
in the below Article.
http://expertsharepoint.blogspot.de/2014/03/sql-reporting-services-installation.html