Easy : Developer 6i uses NET8 to connect, just config NET8 - you could use the Easy Config tool, but I had many many problems with it in Windows XP (after all, it is a very very old applet, written many moons before XP), so I do the config myself, editing SQLNET.ORA e TNSNAMES.ORA files manually : just remember, the files are in %DEVELOPER_HOME%NET80/admin .

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Chiappa