FTP 425 Error: Cannot Open Data Connection

1050 pts.
Tags:
AS/400 FTP
FTP Error Codes
IBM iSeries
iSeries administration
We have several applications that use FTP from the iSeries. All of a sudden a lot of them stopped working once the programs tried sending data (with a PUT or a GET). The error is 'FTP 425 Error: Cannot Open Data Connection'. Our Network Services department here in IT claim it's nothing they did (as expected). However, they like to make security changes without telling anyone. Any idea what they did?

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I can log into all of the servers. The error is ‘FTP 425 Error: Cannot Open Data Connection’ when we attempt a PUT or a GET. It’s a network issue of some sort, because it happened with 3 servers at the same time.

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  • Gilly400
    Hi, Try using passive mode, maybe someone has closed one of the ports on your network connection. Regards, Martin Gilbert.
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  • Batman47
    We are using passive mode. We FTP several different ways.... it only seems to fail if we FTP directily from the iSeries... other methods that do work are from an FTP server, from our network in Japan, from a PC, or using VPN...... just, not directly from the iSeries. We use port 21, which doesn't appear to be the issue since that port works with the other methods. It's been working for years but all of a sudden it stopped working on Friday and my Network Services department are at a loss to explain.
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  • Gilly400
    Hi, Have you tried FTP to the iSeries? Does that work ok? Have you tried FTPing elsewhere from the iSeries? Do you use the same profiles when you FTP from other locations? It sounds like some sort of firewall issue. You get a connection, so your machine must be allowed to connect, but I suspect that something (probably a firewall) is blocking one of the ports that get used for FTP. I believe that FTP uses other ports as well as 21. Can you get someone to see whether there are any logs on your FTP server or firewall? Normally if a connection is rejected there's a log for it somewhere if it's a windows or linux machine. If you're already using passive mode, maybe you can try non-passive mode - I think the 2 modes use different ports. Regards, Martin Gilbert.
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  • Batman47
    Thanks Martin, My network work guy finally figured out that they were having a problem with 'one of the devices on the network'. He fixed the problem. I do appreciate the help, though.
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  • Ccbamatx
    Batman: What was the solution to your 425 problem? I have been working on this awhile!!!! Thanks, CCB
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  • Batman47
    My network guy told me the gateway on the router was pointing to the wrong device.
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