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Please see the following link for the default ports for JDBC to iSeries:
http://www-03.ibm.com/systems/i/software/toolbox/faqports.html
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You can also check with "NETSTAT" on the iSeries if the ports are open.
JDBC driver versions
Please see the comments on IBM DB2.
EBCDIC Encoding
One of our partners came across a special issue with an AS/400 (a.k.a. iSeries a.k.a IBM System i) returning data in EBCDIC encoding to Pentaho Data Integration.
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