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As you can see on below screenshots, eclipse and Android SDK Manager (and other Java programs) are trying to connect to a IPv4 Internet IP via IPv6 TCP/IP stack while Proxifier (a proxy manager program, nevermind) can not support that.
How I can disable IPv6 in Java?
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When you enable IPv6 on a Droplet, both the IPv4 and IPv6 interfaces are available. You can disable IPv4 and rely solely on IPv6, although you will still need to have IPv4 available for the localhost so your programs operate as expected.
I wanted to use this for some program I hadn't control for running that Java app so ended with this _JAVA_OPTIONS=-Djava.net.preferIPv4Stack=true environment variable. (read about _JAVA_OPTIONS here)
If you are using Windows, just run this command on Windows cmd:setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true
Thanks to Jason Nichols for reminding this JVM argument :)
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