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Yes, he doesn't get prompted for the user ID or password at all.
In that case, then it's not the problem I was describing. The problem I was describing would only manifest when trying to send a file or directory listing.
I understand what you're saying about connecting on port 21 and then using a different port to transfer data, but I don't understand why I can dial in to an ISP on my laptop and use a PC based FTP client to connect on port 400 without a problem and uploaded a save file as a test. I figured if it would work for PC to iSeries it would also work for iSeries to iSeries.
It does work exactly the same for a PC as it does for an iSeries. The firewalls and/or NAT routers don't know whether the data is coming from a PC or from an iSeries. They look and act identical. (If they didn't, the two wouldn't be able to talk to each other!)
There must be a firewall or something similar on the customer's end that's blocking port 400, or blocking the source ports that their iSeries is attempting to use.
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