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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[graylog.jar:?] at[graylog.jar:?] at com.mongodb.connection.DefaultServerMonitor$[graylog.jar:?] at[?:1.8.0_101]Caused by: No route to host at Method)[?:1.8.0_101] at[?:1.8.0_101] at[?:1.8.0_101] at[?:1.8.0_101] at[?:1.8.0_101] at[?:1.8.0_101] at com.mongodb.connection.SocketStreamHelper.initialize([graylog.jar:?] at[graylog.jar:?] ... 3 more