After you have completed Installing and configuring Requirements Manager you need to edit the endpoint for rtmService in the RM to RQM Connector process app and redeploy it.
Open SBM Application Repository
Select Process Apps on the left.
Select the RM to RQM Connector process app and click the Deploy button
Click in the Destination field.
Select the environment and click Next.
On the Mappings page, click the Choose Destination Endpoint button to choose the correct endpoint (not rtmService_2).