I searched in the forum and found someone already faced this problem.
The major answer is related to IP address and host name.
I'm also facing with this problem, however I could not solve it by changing IP to server name.
I tested on 2 machines one is Windows server 2008 and other is Ubuntu14.0LTS.
I got same result.
The participants' image are not shown.
The server always show bellowing error when second participant join
java.lang.NullPointerException: Name is null
at java.lang.Enum.valueOf(Unknown Source)
at net.java.sip.communicator.impl.protocol.jabber.extensions.jingle.CandidateType. valueOf(CandidateType.java:15)
at net.java.sip.communicator.impl.protocol.jabber.extensions.jingle.CandidatePacke tExtension.getType(CandidatePacketExtension.java:373)
at net.java.sip.communicator.impl.protocol.jabber.extensions.jingle.CandidatePacke tExtension.compareTo(CandidatePacketExtension.java:386)
at net.java.sip.communicator.impl.protocol.jabber.extensions.jingle.CandidatePacke tExtension.compareTo(CandidatePacketExtension.java:14)
at java.util.ComparableTimSort.countRunAndMakeAscending(Unknown Source)
at java.util.ComparableTimSort.sort(Unknown Source)
at java.util.ComparableTimSort.sort(Unknown Source)
at java.util.Arrays.sort(Unknown Source)
at java.util.Collections.sort(Unknown Source)
at org.jitsi.videobridge.IceUdpTransportManager.startConnectivityEstablishment(Ice UdpTransportManager.java:748)
at org.jitsi.videobridge.Channel.setTransport(Channel.java:1694)
at org.jitsi.videobridge.ComponentImpl.handleColibriConferenceIQ(ComponentImpl.jav a:367)
at org.jitsi.videobridge.ComponentImpl.handleIQ(ComponentImpl.java:466)
at org.jitsi.videobridge.ComponentImpl.handleIQ(ComponentImpl.java:425)
at org.jitsi.videobridge.ComponentImpl.handleIQSet(ComponentImpl.java:518)
at org.xmpp.component.AbstractComponent.processIQRequest(AbstractComponent.java:51 5)
at org.xmpp.component.AbstractComponent.processIQ(AbstractComponent.java:289)
at org.xmpp.component.AbstractComponent.processQueuedPacket(AbstractComponent.java :239)
at org.xmpp.component.AbstractComponent.access$100(AbstractComponent.java:81)
at org.xmpp.component.AbstractComponent$PacketProcessor.run(AbstractComponent.java :1051)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Could any one tell me the reason? and how to fix this?
Thanks a lot