In the working build how long does it normally take to list the directory, was it less than 2 minutes?
The connection is lost because the server is not responding to the "LIST -al" command within the allowed 2 min waiting for reply period.
Do you have a local firewall that might be blocking the FTP server from connecting to your computer? PORT mode connections are incoming from the FTP server.
Or is it possible that the FTP server is unable to reach your computer using the IP provided by the PORT command?
I will do some tests to make sure PORT mode is working as intended, it might be difficult to reproduce this issue without having access to a Humax PVR.
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