You may be unable to log in to Jabber Video if you are trying to log in behind a Cisco ASA firewall. You can reconfigure your firewall settings so that you can log in. See I am a network administrator for my company. What port ranges are you provisioning for Cisco Jabber Video for TelePresence, and what ports should I open on my firewall to enable my employees to use Jabber Video from my company's network? for instructions.