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If you're manually upgrading vCenter, you might run into this error. VMware tells you it's either the media or the Agent that needs to be started. But in my issue, when upgrading from vCenter 5.5 to vCenter 5.5 Update 3, I needed to enable the SQL Agent Service in Services in order to get it to work. Here's my fix: Go to Services Find SQL Server Agent Service and see that it is disabled Right click the service and change it to Automatic in properties Start the service … [Read more...] about Please make sure SQL Server Agent service is running on the Database Server