All -
Mark Bramer and I presented a technical workshop 'Leveraging Stream Services' at the User Conference in San Diego last week. A draft of the slides from the tech workshop are available now online: Real-Time GIS: Leveraging Stream Services
Videos of the technical workshops from the 2015 UC should be available to review and download from Esri's E80 site in a few weeks. Your best bet will probably be to search for the keyword 'GeoEvent' and look for items with the 2015 UC logo:
In the workshop I demonstrated how a very simple feed providing the International Space Station's location (http://api.open-notify.org/iss-now.json) could be brought into the GeoEvent Extension and broadcast out a stream service output. Mark discusses some of the technical aspects of stream services and stream layers, and I have a demo where I add a stream service I publish to a web map as a stream layer.
It looks like folks on this thread are generally able to access the sample stream services:
... and are able to click the View In: ArcGIS JavaScript link to see the streaming data displayed using the Java Script API.
Are you able to browse to a specific stream service's subscription endpoint (e.g. geoeventsample3.esri.com:6080/arcgis/rest/services/SeattleBus/StreamServer/subscribe), click 'Subscribe' and see the streaming Esri Feature JSON displayed on the HTML page?' This is usually your first test to verify that event data you are processing through the GeoEvent Extension is being broadcast by the stream service. From here it is up to a JavaScript client to subscribe and receive the streaming data.
If you are having problems adding a stream service to an ArcGIS Online web map, or a Portal for ArcGIS web map, as a stream layer using a web browser which supports HTML5 WebSockets, your best bet will probably be to contact Esri Technical Support for help identifying the issue. As David suggested, a firewall restriction, restriction related to web sockets, or issues with SSL security certificates can all interfere with a client's attempt to subscribe and receive data being broadcast by a stream service.
Thank you David Blanchard Andreas Espersen and Xander Bakker for contributing to the thread.
Hope this information helps --
RJ