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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

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via Stack Overflow by Ontologiae
, 1 year ago
java.net.UnknownHostException: debian-jessie.vagrantup.com	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:589)	at java.net.Socket.connect(Socket.java:538)	at java.net.Socket.(Socket.java:434)	at java.net.Socket.(Socket.java:211)	at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)	at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148)	at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)