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The NetBeans IDE attempts to connect to the debugger at the Internet Protocol version 4 local host address, 127.0.0.1 . If IP4 networking is not available for the loopback interface, it fails. This is observed where the loop back interface has an IP6 address but not IP4. This problem happens with the Java Debugger. GDB works. To test, on GNU/Linux, one can remove the IP4 address with the command ip address delete 127.0.0.1/8 dev lo This was tested on the main-golden, post 7.4 .