Not able to connect to db2 from java

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Hi All,

I am not able to connect to DB2 database from java, no matter what driver I use.

I either get
"No suitable driver found" for Class.forName("com.ibm.db2.jcc.DB2Driver");

OR

For Class.forName("COM.ibm.db2.jdbc.app.DB2Driver");

"Exception in thread "main" com.ibm.db2.jcc.am.yn: [jcc][t4][2030][11211][3.57.82] A communication error occurred during operations on the connection's underlying socket, socket input stream,
or socket output stream. Error location: Reply.fill(). Message: Insufficient data. ERRORCODE=-4499, SQLSTATE=08001"

Thank you for your help in Advance.