DB2 issue

Hi,
I'm trying to configure RTC 3.0 with DB2 vers 7.
This is my connection properties:
//192.168.23.7:6789/CONTMAN:user=db2admin;password={password};
I have te following exception

Il servizio database non disponibile. Stato database:
Si verificato un errore di comunicazione durante le operazioni sul socket sottostante della connessione, flusso di input del socket o flusso di output del socket. Posizione errore: Reply.fill(). Messaggio: Connection reset. ERRORCODE=-4499, SQLSTATE=08001

Otherwise if using this connection properties:
jdbc:db2//192.168.23.7:6789/CONTMAN:user=db2admin;password={password};
The error is:
java.lang.UnsatisfiedLinkError: db2jcct2 (Not found in java.library.path): ERRORCODE=-4472, SQLSTATE=null.



I think the problem is db2 driver.
which is the correct db connection url?

many thanks