Authorize a license in ArcGIS Administrator
 
- Go to Start > All Programs > ArcGIS > ArcGIS Administrator.
 - Launch ArcGIS Administrator (right-click and Run as Administrator)
 - Click the Desktop tab > Select one of the three Single Use products. Please choose Advanced.
 - Click Authorize Now to launch the Software Authorization Wizard.
 - Choose 'I have installed my software and need to authorize it' > Next.
 - On Authorization Method, choose 'Authorize with Esri now using the Internet' > Next.
 - Fill in Authorization information > Next.
 - Insert authorization number ESU8156....8 > Next.
 - Click on 'I do not want to authorize any extensions at this time' > Next.
 - The authorization process starts.
 - Related documentation: Authorize ArcGIS Desktop Single-Use products and features
 
Document 
 
- You want to use ArcMap with concurrent use licenses so we opened My Esri>Licensing>Licenses information>Authorization> They have an ArcGIS Desktop Advanced concurrent use but were using it for a person that is not more on the company so we recovered the licenses.
 - To recover the licenses we opened My Esri>Licensing>Licensing tools>Recover lost licenses and recovered the licenses successfully.
 - We authorized the licenses on the Licenses Server Manager correctly and made the connection on the ArcGIS Administrator successfully.
 - We have access to ArcMap correctly.
 - You need to provide many people with an ArcGIS Desktop license so I suggest, providing single-use licenses with an authorization file.
 - We created the authorization file on My Esti>Start Licensing> of a single-use license and extension to ArcGIS Desktop.
 - We authorized the single-use licenses on the ArcGIS Administrator correctly and have access to ArcMap. 
 
https://desktop.arcgis.com/en/arcmap/latest/get-started/administer/authorizing-arcgis-single-use-products-and-features.htm

 
 
 
 

 
 
 
 
 
 

 
 
 
 
 

 
 
 
 
 
 
 

 
 
 
 

 
 
 
 
 
 
 
 

 
 
 
 
 
 

 
 
 

 
 
 

 
 
 

 
 
 
 

 
 
 
 

 
 
 
 
 

 
 
 
 
 

 
 
 
 

 
 
 
 
 

 
 
 
 

 
 

 
 

 
 
CORS ArcGIS API for JavaScript renders layers using WebGL. WebGL requires access to the raw image data. The images must meet one of the following requirements:
         Be on the same domain as the application, or  Be hosted on a server that supports CORS, or. Use a proxy.
Our proxy server is written in node.js
             Transparentgov.net has its own proxy server running at https://transparentgov.net:7200 for Secure Sockets Layer (SSL)
             Non Secure Sockets Layer runing at  http://transparentgov.net:7000.   
 
ESRI privide other version of proxy server,  such as ASP.NET, Java/JSP,  PHP.  You can use as well for Arcgis Server that is not enabled for CORS.