this is how I stop the firewall. https://help.ubuntu.com/community/IptablesHowTo
sudo nano -w /root/fw.stop echo "Stopping firewall and allowing everyone..." iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT sudo /root/fw.stop at last I saw the output: huyong@huyong-laptop:~/hbase-0.90.3/bin$ sudo /root/fw.stop stopping firewall I am not sure weather it is what you mean to close the firewall. I don't know if my Hadoop version 0.20.2 and Hbase 0.90.3 version are compatible. Yong On Thu, Jan 5, 2012 at 6:32 PM, Royston Sellman <royston.sell...@googlemail.com> wrote: > Just to check - did you disable it the way Tom suggested? By stopping > iptables? > It's not sufficient just to turn off firewall from the control panel/app. > > Best, > Royston > > > On 5 Jan 2012, at 17:00, yonghu wrote: > >> I have already disabled ipv6 and close the firewall, but I still get >> the same problem. :( >> >> Yong >> >> On Thu, Jan 5, 2012 at 5:16 PM, yonghu <yongyong...@gmail.com> wrote: >>> I set up a pseudo mode, it also needs to close the firewall? >>> >>> Yong >>> >>> On Thu, Jan 5, 2012 at 4:59 PM, Tom Wilcox <tom.wil...@cse.org.uk> wrote: >>>> I've seen that error before. Have you tried turning off your firewalls on >>>> each node? >>>> >>>> I do it like this: >>>> >>>> cat $HADOOP_INSTALL/conf/slaves | xargs -I{} ssh root@{} >>>> '/etc/init.d/iptables stop' >>>> ssh root@jobtracker '/etc/init.d/iptables stop' >>>> ssh root@namenode '/etc/init.d/iptables stop' >>>> >>>> Worth a crack if you haven't tried it yet. >>>> ________________________________________ >>>> From: Leonardo Gamas [leoga...@jusbrasil.com.br] >>>> Sent: 05 January 2012 15:45 >>>> To: user@hbase.apache.org >>>> Subject: Re: zookeeper connection problem in pseudo mode >>>> >>>> I had a similar problem some time ago. The problem seems to be in the ipv6 >>>> configuration. I solved it disabling ipv6 on my host editing /etc/hosts. >>>> >>>> 2012/1/5 yonghu <yongyong...@gmail.com> >>>> >>>>> Hallo, >>>>> >>>>> I tried the pseudo distribution mode of HBase. The Hadoop version is >>>>> 0.20.2. I configured the hbase-site.xml as >>>>> >>>>> <configuration> >>>>> <property> >>>>> <name>hbase.rootdir</name> >>>>> <value>hdfs://localhost:9000/hbase</value> >>>>> </property> >>>>> <property> >>>>> <name>dfs.replication</name> >>>>> <value>1</value> >>>>> </property> >>>>> </configuration> >>>>> >>>>> as same as in core-site.xml and hdfs-site.xml files of Hadoop, separately. >>>>> >>>>> I can successfully start HBase. But when I tried to create a table, I >>>>> got following error information: >>>>> ERROR: org.apache.hadoop.hbase.ZooKeeperConnectionException: HBase is >>>>> able to connect to ZooKeeper but the connection closes immediately. >>>>> This could be a sign that the server has too many connections (30 is >>>>> the default). Consider inspecting your ZK server logs for that error >>>>> and then make sure you are reusing HBaseConfiguration as often as you >>>>> can. See HTable's javadoc for more information. >>>>> >>>>> And I checked my ZK log and found: >>>>> >>>>> 2012-01-05 15:59:02,909 INFO org.apache.zookeeper.ClientCnxn: Opening >>>>> socket connection to server localhost/0:0:0:0:0:0:0:1:2181 >>>>> 2012-01-05 15:59:02,909 WARN org.apache.zookeeper.ClientCnxn: Session >>>>> 0x134ae4d4a6d0001 for server null, unexpected error, closing socket >>>>> connection and attempting reconnect >>>>> java.net.ConnectException: Connection refused >>>>> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) >>>>> at >>>>> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567) >>>>> at >>>>> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119) >>>>> >>>>> This error information appeared repeatly. Can anyone tell how to solve >>>>> this problem? >>>>> >>>>> Thanks! >>>>> >>>>> Yong >>>>> >>>> >>>> >>>> >>>> -- >>>> >>>> *Leonardo Gamas* >>>> Software Engineer >>>> +557134943514 >>>> +557581347440 >>>> leoga...@jusbrasil.com.br >>>> www.jusbrasil.com.br >