Failed to connect to the specified DBMS instance. A database connection exception has occurred. A product licensing error occurred

Error Message

Attempts to establish a new database connection in ArcGIS Pro fail and return the following error:

Error:
Failed to connect to the specified DBMS instance. A database connection exception has occurred. A product licensing error occurred.

Cause

The keycodes file used to create the connection from ArcGIS Server is expired. The expiration date can be identified by opening the keycodes file using a text editor, for example, Notepad++, and checking the date specified in the strings provided in the file, as shown in the following image.

Solution or Workaround

To resolve the issue, generate and retrieve the new keycodes file.

1. Retrieve the latest version of the keycodes file depending on the following scenarios:

• On the ArcGIS Pro machine without ArcGIS Server installed, generate the new keycodes file. Refer to How To: Generate a keycodes file to authorize an enterprise geodatabase when an ArcGIS Server instance is unavailable for instructions.
• On the machine running ArcGIS Server, the keycodes file can also be found in the following folder location:

C:\Program Files\Esri\Licenses<version>\sysgen

2. Connect to the database. Refer to ArcGIS Pro: Database connections in ArcGIS Pro for more information.