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Updated April 4, 2017
The Web Console is blank or is empty after upgrading to NPM 12 or later. The following error is found in the Orion web log:
2016-07-29 09:23:45,086  ERROR SolarWinds.Orion.Common.ConnectionStringProvider - File doesn't exists
2016-07-29 09:23:45,086  ERROR SolarWinds.Orion.Common.ConnectionStringProvider - ConnectionString wasn't found in
2016-07-29 09:23:45,086  ERROR SolarWinds.Orion.Common.OrionConfiguration - Settings file 'SWNetPerfMon.DB' N/A - System.AggregateException: One or more errors occurred.
NPM 12 and later
Note: If this resolves the issue, you will need to change the AppPool identity from NetworkService to LocalSystem each time that Configuration Wizard is run.