Blacklisting IP's in Host Access Control blocks FTP connections?

Hi, I recently added a rule in the Host Access Control to deny all IP addresses except my own in Host Access Control in the WHM. When I try to connect to FTP myself it all works fine but when a developer with a different IP (Working Remotely) tries to connect, the FTP connection times out for him. I can still see the logs of him being connected in the FTP connections in the cPanel but it doesn't let him get in it basically gets stuck on Listing Directories and then it sends an error that connection timed out. If it is a case of blocking the connection, that's a fairly strong feature (Security Wise).