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Am 04.10.2022 um 22:58 schrieb Justin Taylor <jtaylor.0ab@xxxxxxxxx>:
We're trying to use 5250 to download an update from an ISV using clear-text FTP. It connects fine, and we can do a "cd". A "dir" command just sits there, apparently doing nothing. A subsequent "cd" appears to work fine. A "get" command just sits there, apparently doing nothing.
This is a clear sign of a firewall issue. Actual data is transferred over a secondary connection and this can't be established. Commands (such as cd) work.
See Richard's comment about active/passive FTP.
The vendor is adamant the problem is on my end. Any suggestions on what I should check?
If you're behind NAT to the internet, always use passive FTP. This must work, because the data connection is then established from inside to outside. If this doesn't work, have your network guy fix firewall rules from inside to outside. A decent firewall looks into the FTP control connection packets (Port 21) and opens up the ports for the data connection(s) dynamically. I know that some point'n click firewalls can't do this, such as pfSense and you need to manually take care as Don explained.
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