SharePoint Designer 2013: HTTP service located at AppMng.svc is unavailable

Question

In SharePoint 2016, I have created a SharePoint list workflow using SharePoint Designer 2013 and when I published the new workflow I faced the following error 

"system.servicemodel.servertoobusyexception: The HTTP service located at http://siteurl:32843/66f23414df0e48aa8e0892c64a912ff0/AppMng.svc is unavailable.
This could be because the service is too busy or because no endpoint was found listening at the specified address.
Please ensure that the address is correct and try accessing the service again later.
 ---> System.Net.WebException: The remote server returned an error: (503) Server Unavailable.
at System.Net.HttpWebRequest.GetResponse()"

Could you please help me to fix this issue?

Answer 1

HTTP service located at AppMng.svc is unavailable

The "AppMng.svc is unavailable" usually occurs if

• The App Management Service is not configured in SharePoint.
  • To configure App Management Service, Please check App Management Shared Service Proxy is not installed
• The App Management Service is configured but it is stopped
  • To restart App Management Service, Please check Can’t Publish SharePoint Workflow
    
• The App Management Service is configured and started properly, but the App management Service Application Pool is stopped in IIS.
  • To restart App management Service Application Pool in IIS, you should first get its corresponding Guid of SharePoint Application Service, then restart the App management Service Application Pool as mentioned in Start App Management Service Application Proxy.

Note: If the Application Pool of App management Service started then stopped again, so maybe the assigned service account that used to run this service doesn't have the sufficient permission to log in as Service, for more details, please check SharePoint 2019: Service Accounts Recommendations.

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