Here's a wonderfully helpful document from IBM summarizing the ports used by the various Toolbox features (including JDBC):



http://www-1.ibm.com/servers/eserver/iseries/toolbox/faqports.htm



From it, it appears that JDBC will require ports: 449, 8470, 8471, and 8476. If you're using SSL (which I'm going to guess you're not), there are different corresponding ports listed.



Also, we've had many headaches when there's a firewall between the two boxes. You'll want to configure your app server (if you're using one) for a minimum pool size of zero since if your connection(s) lay idle, the firewall may disconnect them ungracefully...



Best of luck!