java.net.ConnectException: Connection refused: connect

java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at java.net.Socket.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:211)

This error occurs when the client is not able to connect to the server. There are several things can make this error happen.

1. The server is down.

2. The server is not listening on the port.

3. The client is using a wrong IP address or port.

4. The server and/or client are not connected to the network.

5. The firewall on the server and/or client is blocking the connection.

References:

1. How to Fix java.net.ConnectException: Connection refused: connect in Java

2. java.net.ConnectException – How to solve Connect Exception

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