How to configure PASV mode for Serv-U FTP Server:

Step 1.

To choose a PASV Port Range highlight where it says, "settings".
Then you click on the "advanced" tab, and enter the PASV Port Range
of 50000-50049, then click "apply".

Unlike other FTP Servers, Serv-U FTP Server limits you to only 50 PASV ports.

Step 2.

On the tree structure on the left side of the screen, highlight, "Settings"
under, "Wizard Generated Domain" or under whatever domain you are
working on.

Then, click on the right arrow to expose the, "Advanced" tab.

Step 3

Put a checkmark on, "Allow passive mode data transfers, use IP" and enter your
Outside IP address, then click on, "Apply"..

(For this example, we will use the IP address of 121.24.96.36. Your outside IP
will be different.)