When using IBM's opensource JTOpen JDBC driver to connect ColdFusion MX to DB2 running on an iSeries (formerly AS/400), the ColdFusion MX server may hang if a bad username or password is sent to the database. When this occurs, a restart of the ColdFusion service is required and, in some cases, a reboot of the server. The TechNote below will give you a workaround for this problem.
JTOpen JDBC Driver Hangs When a Bad User Name or Password is Sent to the Database