Error while Deploy Azure App Service : ERROR_COULD_NOT_CONNECT_TO_REMOTESVC

I am getting below error while deploying app service via Azure DevOps. I tried to search for this issue but could not found root cause of this.

Error :

2021-03-15T06:01:27.7479723Z ##[error]Error: Error Code: ERROR_COULD_NOT_CONNECT_TO_REMOTESVC
More Information: Could not connect to the remote computer ("web-app.scm.azurewebsites.net") using the specified process ("Web Management Service") because the server did not respond. Make sure that the process ("Web Management Service") is started on the remote computer.  Learn more at: http://go.microsoft.com/fwlink/?LinkId=221672#ERROR_COULD_NOT_CONNECT_TO_REMOTESVC.
Error: The remote server returned an error: (403) Forbidden.
Error count: 1.
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Solution

Thank you Edward for insightful explanation for possible root cause. Issue is resolved now. Root cause was the agent pool selected did not have rights for deployment(IP are not whitelisted for production App service) since We are not using agent provided by DevOps directly for production environment. enter image description here