I created a local fabric in the Fabric Explorer in the IDE and started getting these exceptions about every second !MESSAGE Unable to open socket to 0:0:0:0:0:0:0:1/0:0:0:0:0:0:0:1:2181 2012-03-22 12:06:02,199 [main-SendThread(0:0:0:0:0:0:0:1:2181)] WARN org.apache .zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing s ocket connection and attempting reconnect java.net.SocketException: Address family not supported by protocol family: conne ct at sun.nio.ch.Net.connect(Native Method) ~[na:1.6.0_31] at sun.nio.ch.SocketChannelImpl.connect(Unknown Source) ~[na:1.6.0_31] at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnx nSocketNIO.java:203) ~[na:na] at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO. java:213) ~[na:na] at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.ja va:952) ~[na:na] at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:979) ~ [na:na] Not sure if this is normal, maybe I just need to config something... but when I removed the local fabric in the explorer, I kept getting these exceptions. The only way to stop them was to shutdown the IDE and restart. Maybe some additional shutdown commands need to be issued when deleting a fabric?