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    Signals that an error occurred while attempting to connect a socket to a remote address and port. Typically, the remote host cannot be reached because of an intervening firewall, or if an intermediate router is down.

com.mongodb.MongoSocketOpenException: Exception opening socket at com.mongodb.connection.SocketStream.open(SocketStream.java:63)[graylog.jar:?] at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:115)[graylog.jar:?] at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:116)[graylog.jar:?] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_101]Caused by: java.net.NoRouteToHostException: No route to host at java.net.PlainSocketImpl.socketConnect(Native Method)[?:1.8.0_101] at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)[?:1.8.0_101] at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)[?:1.8.0_101] at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)[?:1.8.0_101] at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)[?:1.8.0_101] at java.net.Socket.connect(Socket.java:589)[?:1.8.0_101] at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:50)[graylog.jar:?] at com.mongodb.connection.SocketStream.open(SocketStream.java:58)[graylog.jar:?] ... 3 more