Open Manage Essentials gives an error on loading.

Database login failed.

Logs says Data cache load error. SmartConsole.DataServiceReference.IsApplicationGuidValidCompletedEventArgs

 This is followed by a login screen where I login with my Windows credentials which fails and gives another error.

Error: A network related or instance specific error occured while establishing a connection to SQL server. The server was not found or was not accessible. Verify that instance name is correct and that SQL server is configured to allow remote connections.

Please help.