Management Data Warehouse SQL Server data collection reports I configured MDW on an SQL Server instance but when I try to access the reports from the MDW DB, the reports show information until a couple of days ago and I am getting 'collection set is not running. The data displayed here is from a previous run' as per below:

Why does this happen?
You have to enable Data Collection


  Using SQL Server Management Studio
  
  
  In Object Explorer, expand the Management node.
  Right-click Data Collection, and then click Enable Data Collection.
  


or Using Transact-SQL

USE msdb;  
GO  
EXEC dbo.sp_syscollector_enable_collector;


FYI, MDW works using SQL Agent jobs, so the Agent has to be started and collector's jobs have to be enabled.