It appears that you have not enabled integrated login or using the applications from a machine not part of the same domain. Please check on the streaming console for the following:
1. Under Configuration > Launch Server > Basic see if the check box for "Enable Automatic Domain Authentication" is checked. If not check it and restart the front end server from the Component Status screen
2. Check if the domain you have configured on the streaming console is the same as the one end point is a part of and the logged user is a part of. If not try from a machine that is part of the same domain by logging onto windows using user credentials that is part of the same domain
3. If both of these are already set, confirm that the streaming servers (front end and back end) are part of the same domain as well
Let us knwo what you find.
Hope this helps.