hello, facing exactly the same issue.
Ubuntu# java -version
java version "1.8.0_72" Java(TM) SE Runtime Environment (build 1.8.0_72-b15) Java HotSpot(TM) 64-Bit Server VM (build 25.72-b15, mixed mode) 14.04.4 LTS
I've tried to install it on jeknins latest 1.6.x version, got this problem first, then tried to disable firewall, then upgraded to 2.5 - no luck, then upgraded all plugins - no luck, added -Djava.net.preferIPv4Stack=true, disabled IPv6 completely, removed all ipv6 entries from /etc/hosts, tried to access Jenkins via Nginx reverse-proxy and directly - no luck.
Restarted jenkins after each step, exception message did not change.
I'm not sure it it's a bug or my server misconfiguration. Any idea what else I can check ?
Would be great to know what address:port it tries to connect when throwing this exception:
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