IntelliJ IDEA 2020.2 cannot build my maven projects (Connection refused to host: 127.0.0.1)

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java.lang.RuntimeException: Cannot start maven service 

. . . . .

Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:

. . . . .

Caused by: java.net.ConnectException: Connection refused (Connection refused)

ho can i solve this issue?

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It looks like something is blocking connections to localhost. Please see the manual for possible reasons at https://intellij-support.jetbrains.com/hc/en-us/articles/360014262940-Unable-to-import-Maven-project-import-fails-with-error-Cannot-reconnect .

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