IBM i QuickTip: When You Can’t FTP from a Windows Desktop to an IBM i

Posted on by Joe Hertvik

ftpHere’s a common fix for when you can’t perform a Windows FTP transfer with your IBM i partition.

It’s common for a Windows-to-IBM i FTP transfer to get blocked when the Windows desktop firewall blocks port 20 traffic to the Windows desktop (port 20 is used in the FTP data transfer).

You may even see your FTP session connect to your IBM i partition but fail when it tries to transfer data. Sometimes the desktop will display an FTP 425 error–Unable to open data connection. This recently happened to a client of mine who was having trouble performing an FTP upload from a FedEx server on their warehouse floor.

The best way to take care of this is to turn off the Windows firewall on the blocked machine. That should allow you to complete the transfer.

(originally posted on May 1, 2013. Reposted on November 18, 2013)

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About Joe Hertvik

Joe is the owner of Hertvik Business Services, a service company providing written white papers, case studies, and other marketing content to computer industry companies. He is also a contributing editor for IT Jungle and has written the Admin Alert column for the past ten years. Follow Joe Hertvik on Twitter @JoeHertvik. Email Joe for a free quote on white papers, case studies, brochures, or other marketing materials.
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