We have a .Net windows application for managing live WebEx meetings. In this application, we use a Pop up alert message for the notification of a meeting request. Recently we tested our application for IE 11 version. When we test the application in our local machine, the popup alert works fine . But when testing is done on the client machine for the same IE 11 version , the popup alert message doesn't appear over there . While for IE 9 ,the popup alert is working fine in both local machine and the client machine.
What can be the issue/resolution for this ?