There is an issue caused by cPanel and WHM’s implementation of PureFTP and ProFTPd which on the other hand cause an issue on NAT-configured networks on cPanel and WHM version 64 and older than that. So this issue helps in preventing the Passive FTP connections to the other IP addresses there on the server and connections through domains that resolve to other IP addresses.
As a warning it should be kept in mind that this workaround is a temporary fix for the NAT-configured servers available on the cPanel & WHM version 64 and older. One can therefore reconfigure the FTP server, and the ForcePassiveIP or MasqueradeAddress settings to the configuration file will be added again by the system.
1- One needs to follow the current procedure in the How to Enable FTP Passive Mode document in configuring the Passive FTP on a NAT-configured network.
One should be able to connect to all FTP-enabled domains on the server along with a Passive FTP session.
It is to note that the NAT configurations are ordinarily associated with securing environments, because of which one is strongly recommended to use our Web Disk feature instead of using FTP for file transfers. Contrary to FTP, Web Disk encrypts usernames and passwords, and also transfers files over secure connections.
This feature helps in preventing passive FTP connections to various other IP addresses on the server and many more. This can be done by following certain technical steps.