jCoClientConnection test

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Hi,

I'm trying to connect the PDK to one of our R/3 systems and seem to have run into a snag. When running the system viewer, everything works. When running the jCo destination viewer, everything works. When running the System Test, the "Check for launching WinGUI and PlatinGUI transactions" works and the "Check for launching WebGUI transactions, EasyWebTransactions and BW 2.x objects" works. BUT... when running the JCOClientConnection test, I get this:

Test failed: Getting JcoClientService ...

Variant: jCo connection test for DEVCLNT300

Client successful created

Error while getting connection:

Stack trace:

com.sap.mw.jco.JCO$Exception: (103) RFC_ERROR_LOGON_FAILURE: Open file 'saprfc.ini' failed: 'No such file or directory'

Client logon data

USER = null

I don't know what to do from here. I read one post that said something about applying patches, but what kind of patches are there for the PDK? Where would I find this file?

TIA (thanks in advance).

Kevin