I can't connect to my DB2 database.

When I try to connect, a "Connection" box pops up with a big red "X" and this error message: "com.ibm.db2.jcc.b.kc".

My configuration is:
Linux Fedora 7
IBM DB2 8.2 ESE

My eclipse configuration is:
Java Eclipse 3.2.0
SQL Explorer 3.0.0

Using the following configuration (Including class path):
/opt/db2/sqllib/java/db2jcc.jar
/opt/db2/sqllib/java/db2jcc_license_cu.jar
Driver class name: com.ibm.db2.jcc.DB2Driver
Connection URL: jdbc:db2://server.mydomain.com:50000/database_name

Anyone knows how to solve this problem? 

Thanks