hi Would anyone please help me handling below exception while using sip communicator 2594 [NetworkDiagnosticsThread] ERROR common.NetworkDiagnostics - The network diagnostics process has failed with the following exception net.java.stun4j.StunException: An Exception occurred while sending message bytes through a network socket! at net.java.stun4j.stack.NetAccessManager.sendMessage(NetAccessManager.java:397) at net.java.stun4j.stack.StunClientTransaction.sendRequest(StunClientTransaction.java:205) at net.java.stun4j.stack.StunProvider.sendRequest(StunProvider.java:95) at net.java.stun4j.client.BlockingRequestSender.sendRequestAndWaitForResponse(BlockingRequestSender.java:79) at net.java.stun4j.client.NetworkConfigurationDiscoveryProcess.doTestI(NetworkConfigurationDiscoveryProcess.java:284) at net.java.stun4j.client.NetworkConfigurationDiscoveryProcess.determineAddress(NetworkConfigurationDiscoveryProcess.java:186) at net.java.sip.communicator.common.NetworkDiagnostics.run(NetworkDiagnostics.java:94) Caused by: java.lang.NullPointerException: null address || null buffer at java.net.PlainDatagramSocketImpl.send(Native Method) at java.net.DatagramSocket.send(DatagramSocket.java:611) at net.java.stun4j.stack.NetAccessPoint.sendMessage(NetAccessPoint.java:200) at net.java.stun4j.stack.NetAccessManager.sendMessage(NetAccessManager.java:393) ... 6 more Thanks Rajesh --------------------------------- Yahoo! India Matrimony: Find your partner now.