Product:
Cognos BI 10.2.1
Windows 2008 R2 server

Problem:
When run a report and then click on link to drill down to other report (or same report with other parameters) you get an error message.
Error Message:
DPR-ERR-2014
Unable to load balance the request because no nodes in the cluster are available, or no nodes are configured for the service: reportService.

Possible solution:
Check the report in Report studio.
The link is pointing to a report that does not exist, probably have you changed the name of the report, and not updated the links inside the report to this new name.
The error is misleading that there is a platform issue, first check that the report exist with the name that is requested.