The problem is that 9i release 2 to v7 connections are NOT supported. You could revert to an earlier 9i release like 18.104.22.168.1 and it would work, but with release 2, you're out of luck. This is well documented and lots of folks have had issues with this very same thing. Oracle basically says the "fix" is to migrate from your v7 database to 9.2 as a direct upgrade from 7.3.4 to 9.2 is supported.
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