During installation of Windows Media Services, an on-demand Default publishing point and a sample broadcast publishing point are added. To prevent unauthorized access to the publishing points immediately after installation, two security measures are added: the Default publishing point is set to deny all connections, and the Start publishing point when first client connects property of the sample broadcast publishing point is disabled. In order to use the Default publishing point, you must first configure it to allow connections.
If you do not change the access properties of these publishing points and attempt to test a stream by clicking the Test button on the Source tab, you will receive a warning message that access is denied on a publishing point and you will be asked if you want to change the setting. Clicking Yes will automatically change the setting and the test will begin.