org.netbeans.api.db.explorer.DatabaseException: connection error; Connection failure. sendMethodRequestNoFlush(...).
        at org.netbeans.modules.db.explorer.DatabaseConnector.performDisconnect(DatabaseConnector.java:196)
        at org.netbeans.modules.db.explorer.DatabaseConnection.disconnect(DatabaseConnection.java:933)
        at org.netbeans.modules.db.explorer.action.DisconnectAction$1.run(DisconnectAction.java:97)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:577)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1030)