No response from server when connect to talk.renren.com

This should not a typical issue but I can get access to the server by iChat.At smack I even cannot connect to the server,but the debug windows shows the server is accessable.

Connection failed. No response from server.:

at org.jivesoftware.smack.PacketReader.startup(PacketReader.java:119)

at org.jivesoftware.smack.XMPPConnection.initConnection(XMPPConnection.java:568)

at org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection. java:527)

at org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:953)

at net.shisoft.rmi.server.svr.plugin.XMPPCore.Login(XMPPCore.java:177)

at net.shisoft.rmi.templates.SvrPluginTemplate.LoadSvr(SvrPluginTemplate.java:48)

at net.shisoft.rmi.server.UserSvr.TestLoad(UserSvr.java:330)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:303)

at sun.rmi.transport.Transport$1.run(Transport.java:159)

at java.security.AccessController.doPrivileged(Native Method)

at sun.rmi.transport.Transport.serviceCall(Transport.java:155)

at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)

at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790 )

at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java: 886)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

at java.lang.Thread.run(Thread.java:680)

here comes the packets

sent:

<stream:stream to=“talk.renren.com” xmlns=“jabber:client” xmlns:stream=“http://etherx.jabber.org/streams” version=“1.0”>

<stream:stream to=“talk.xiaonei.com” xmlns=“jabber:client” xmlns:stream=“http://etherx.jabber.org/streams” version=“1.0”>

</stream:stream>

received:

<?xml version='1.0'?>

stream:featuresPLAIN</mechanis ms></stream:features>

<?xml version='1.0'?>

stream:featuresPLAIN</mechanis ms></stream:features>

Thanks for your attention