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The TCP/IP connection to the host has failed. java.net.UnknownHostException:
com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed. at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.checkClosed(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerStatement.checkClosed(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerResultSet.checkClosed(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerResultSet.next(Unknown Source) at Boom.MaakBoomStructuur(Boom.java:241) at Boom.access$0(Boom.java:110) at Boom$2.run(Boom.java:74) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160) at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)