FTP
227 Entering Passive Mode
Entering Passive Mode. The server provides an IP address and port number for the client to connect to for data transfer, formatted as (h1,h2,h3,h4,p1,p2).
When You See This Code
After issuing the PASV command. The server switches to passive mode and tells the client where to connect for data transfer.
How to Fix
No fix needed — parse the IP and port from the response to establish the data connection. If connections fail, check NAT/firewall rules on the passive port range.