http://blogs.technet.com/b/premal/archive/2010/08/13/external-live-meeting-client-cannot-join-meeting-however-communicator-can-sign-in-remotely.aspxAs per my promise in my prior blog :-) Here are the details on a Web Conferencing Escalation/Debug we did recently. Thank you also to Jigar Dani (our latest addition to the team) who helped with troubleshooting. Symptom: ========= Externalen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)