AlterNet Access Mapping URL not adding in SharePoint 2010?

Hi, I am not able to add new AAM URL in one Web Application, I tried first Central admin and it was showing progress for long time then I tried below PowerShell:

“New-SPAlternateURL https://test.my.point.world.com -Zone "Internet", and this command also executing for long time then I have to stop the command.

In other web application I can add AAM URL via Central Admin and PowerShell both but problem is with only one web app.