Connexion à une base Oracle

bonsoir,
hier j'ai formaté mon pc et j'ai installé windows sweet 6.2, oracle 10g, jdk1.6 et netbeans7.0.
j'ai mis le driver ojdbc6.jar dans ce dossier
E:\Program Files\Java\jdk1.6.0_16\jre\lib\ext\ojdbc6.jar

le driver est chargé, la connection est bien établie sans problème.
aujourd'hui il m'affiche cet erreur

Code:

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Driver chargé java.sql.SQLException: Exception d'E/S: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4)))) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:334) at oracle.jdbc.ttc7.TTC7Protocol.handleIOException(TTC7Protocol.java:3668) at oracle.jdbc.ttc7.TTC7Protocol.logon(TTC7Protocol.java:353)

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Code:

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Class.forName("oracle.jdbc.OracleDriver").newInstance(); System.out.println ("Driver chargé"); cnx = DriverManager.getConnection ("jdbc:oracle:thin:@127.0.0.1:1521:orclaudi","system","admin");

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bd: orclaudi
nom utilisateur: system
login: admin

s'il vous plait aidez moi à résoudre ce problème :(, merci

1 - Arrives-tu à te connecter avec d'autres outils (sqldevelopper)
2 - Le port 1521 est-il ouvert (voir firewall)
3 - Le login et mot de passe sont-ils corrects?

Citation:

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Erreur 12505 :
12505, 00000, "TNS:listener does not currently know of SID given in connect descriptor"
// *Cause: The listener received a request to establish a connection to a
// database or other service. The connect descriptor received by the listener
// specified a SID for an instance (usually a database instance) that either
// has not yet dynamically registered with the listener or has not been
// statically configured for the listener. This may be a temporary condition
// such as after the listener has started, but before the database instance
// has registered with the listener.
// *Action:
// - Wait a moment and try to connect a second time.
// - Check which instances are currently known by the listener by executing:
// lsnrctl services <listener name>
// - Check that the SID parameter in the connect descriptor specifies
// an instance known by the listener.
// - Check for an event in the listener.log file.

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