[Solved] Hadoop failed on connection exception: java.net.ConnectException: Connection refused

First use the following command to check whether the port number is enabled

sudo netstat -ntlp

If you don’t find the port number you want to connect to, go to core-site.xml to see if you have this port number.

I don’t deserve 8020. I haven’t been connected with 8020 for a long time.


You can change the port number of the connection to your own

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