Collaborate requires an HTML 5 web socket connection be allowed on browsers and networking appliances such as proxy servers. Users trying to connect from networks that do not allow HTML 5 Web Socket connections will be unable to launch a Collaborate session.
The J10 and J11 error messages indicate that a network connection is blocking HTML 5 web socket connections. These error messages are usually the direct result of a network firewall configuration issue on campus or at your workplace.
Please have your local network administrator test to see if HTML 5 Web Socket connections are permitted on your network by following the instructions found in the following article: https://blackboard.secure.force.com/apex/publickbarticleview?id=kA770000000CbvQ
You can also try accessing Collaborate from another network (coffee shop, local library, cellular hotspot) on the same computer. If you are able to access Collaborate from another network, then this indicates that the school or workplace network firewall configuration is most likely the cause of the J10 or J11 error message that you are receiving.
The J10 and J11 error message almost always happen when a user is accessing from a school or work network. However, if you are at home when this happens, please follow the home network troubleshooting steps found in the Collaborate home network troubleshooting guide found here: https://blackboard.secure.force.com/publickbarticleview?id=kA71O0000008PM6