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We need to handle the exception carefully in order to fulfill the communication problem. jdk Download sources com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect . java.net.ConnectException: Connection refused: connect Connection refused: connect hivehive 2. 18080 Tomcat 2ulimit -u //hostInterSocketAddress socket.bind(new InetSocketAddress(port)); // socket.bind(new InetSocketAddress(host,port)); // bindhosthost java.net.ConnectException: Connection refused: no further information finalshellUbuntu Java tutorial to troubleshoot and fix java.net.ConnectException: Connection refused: connect exception, which is quite common in client server architecture and comes, when clients tries to make TCP connection and either server is down or host port information is not correct. hiveserver2 beeline hiveserver2 1000000 10000 . : . 2java.net.ConnectException: Connection refused: connect new Socket(ip, port) ipipip 2. 18080 Tomcat 2ulimit -u Beginning Java 21 . In this case, first of all you need to check the java version using below command: java -version after running this command you get something like this: java version "1.7.0_51" OpenJDK Runtime Environment (rhel-2.4.5.5.el7-x86_64 u51-b31) OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode) then use this command: LANJava java.net.ConnectExceptionConnection refused 4java.net.ConnectException localhost and 127.0.0.1 are both ways of saying 'the current machine'. java.net.ConnectException: Connection refused: connect1. Run java with the option -Djava.net.preferIPv4Stack=true to force java to use IPv4 instead of IPv6. 2. 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Java tutorial to troubleshoot and fix java.net.ConnectException: Connection refused: connect exception, which is quite common in client server architecture and comes, when clients tries to make TCP connection and either server is down or host port information is not correct. Sockets and Internet Protocols 3 . Redis Connection refused: no further information LettuceRedis Connection refusedredisIPIP192.168.1.101Redis ConnectException: Connection refused: connect. LANJava java.net.ConnectExceptionConnection refused 4java.net.ConnectException AmqpConnectException: java.net.ConnectExceptionConnection refused usernamepasswordguestguestIP(127.0.0.1) java.net.ConnectException: Connection refused:connect 2. : . 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