Can't access any external FTP server

I host an internal FTP server and I can access it just fine from internal and external hosts.

However, I cannot access any external/public FTP servers from any internal hosts.

I have the following rule for external FTP access:

It does not matter if I make it the first rule or any other position.


For testing, I have turned off all DNAT and Full NAT rules for my internal FTP server but I still cannot access any external FTP servers.

I'm not using the FTP proxy under Web Protection.

Below are the DNAT and Full NAT rules for my internal FTP Server:


Below is the Full NAT rule that allows internal hosts to access the internal FTP server:


What am I doing wrong? I see nothing related in the Firewall or IPS logs.