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java.net.ConnectException: Connection refused	at java.net.PlainSocketImpl.socketConnect(Native Method)	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:579)	at java.net.Socket.connect(Socket.java:528)	at java.net.Socket.(Socket.java:425)	at java.net.Socket.(Socket.java:280)	at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)	at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)	at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)	at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)	at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)	at org.apache.hadoop.yarn.server.webproxy.WebAppProxyServlet.proxyLink(WebAppProxyServlet.java:185)	at org.apache.hadoop.yarn.server.webproxy.WebAppProxyServlet.doGet(WebAppProxyServlet.java:336)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:66)	at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:900)	at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:834)	at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:795)	at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)	at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)	at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)	at org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:109)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)	at org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1183)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)	at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)	at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)