ciao a tutti, sto lavorando con netbeans su un database sql. improvvisamente la connessione al database è caduta.....con il seguente messaggio di errore:

java.net.ConnectException
MESSAGE: Connection refused: connect

STACKTRACE:

java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl .java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSoc ketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.j ava:366)
at java.net.Socket.connect(Socket.java:519)
at java.net.Socket.connect(Socket.java:469)
at java.net.Socket.<init>(Socket.java:366)
at java.net.Socket.<init>(Socket.java:209)
at com.mysql.jdbc.StandardSocketFactory.connect(Stand ardSocketFactory.java:256)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)
at com.mysql.jdbc.Connection.createNewIO(Connection.j ava:2744)
at com.mysql.jdbc.Connection.<init>(Connection.java:1 553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonReg isteringDriver.java:285)
at org.netbeans.modules.db.explorer.DbDriverManager.g etConnection(DbDriverManagaer.java:122)
at org.netbeans.modules.db.explorer.DbDriverManager.g etConnection$2.run(DatabaseConnecion.java:533)
at org.openide.util.RequestProcessor$Task.run(Request Processor.java:561)
at org.openide.util.RequestProcessor$Processor.run(Re questProcessor.java:986)

anche quando cerco di accedere al pannello di xampp mediante "localhost", mi risulta impossibile visualizzare la pagina.
help me!! come posso risolvere??????