RE: Troubleshooting FTP

[Scott Klement <midrange-l@xxxxxxxxxxxxxxxx>]

> 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.