Your SCOM environment may produce the following alert on the RMS server:

Alert

Alert: Data Warehouse failed to request a list of management packs from SQL RS server
Source: 24c6a0cc-5f00-4a8c-9a40-fa4d4218c2e3
Path: Not Present
Last modified by: System
Last modified time: 8/26/2015 3:55:52 PM Alert description: Data Warehouse failed to request a list of management packs which contain reports deployed to SQL Reporting Services Server.
WebException: The operation has timed out

Check whether the data warehouse write user has a proxy server active. If this is the case, log in with that user on the RMS, and disable the proxy, or reconfigure it so it bypasses local addresses.