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Error: Could not connect to an ArcGIS license manager running on host "Not_Set"

Error Message

When launching ArcMap, the following error is returned: "Could not connect to an ArcGIS license manager running on host "Not_Set""

Cause

This error occurs when the location of the ArcGIS License Manager is not specified after authorizing ArcMap with a Concurrent Use License.

Solution or Workaround

Authorize ArcMap with a Single-Use License
ArcMap is authorized with either a Concurrent Use or Single-Use License. Single-Use License authorization is performed on the machine ArcMap is installed and requires an authorization code that can be found on MyEsri. For more information on authorizing ArcMap for single-use, see ArcMap: Authorizing your software.

Note:
Users must have administrator rights on the machine to select a Single-Use License in ArcGIS Administrator. In Windows, this can be done by right-clicking ArcGIS Administrator and clicking Run as administrator.
 

Set the license manager location
If the error occurs when using a Concurrent Use License, set the location of the license manager in ArcGIS Administrator. For more information on setting the license manager location, see How To: Connect to a License Manager for ArcGIS Desktop 10x via ArcGIS Administrator.

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