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).

On this page

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.

Specification

View RFC / Specification →

Comparisons

FTP 227 Passive Mode vs 229 Extended Passive Mode

Compare With

110 Restart Marker Reply 120 Service Ready Soon 125 Data Connection Open 150 File Status OK 200 Command OK 202 Command Superfluous 211 System Status 212 Directory Status 213 File Status 214 Help Message 215 System Type 220 Service Ready

Guides

FTP Reply Codes: Understanding File Transfer Responses DNS & Networking

TCP Three-Way Handshake and Connection Lifecycle DNS & Networking

Essential Network Debugging Tools: ping, traceroute, mtr, and tcpdump DNS & Networking

RFC 959: FTP Protocol Deep Dive Protocol Deep Dives

TLS 1.3: Faster, Simpler, More Secure Protocol Deep Dives

Migrating from FTP to SFTP: A Complete Transition Guide Migration & Upgrades

HTTP Access Log Management: Rotation, Parsing, and Analysis Production Infrastructure

Debugging Scenarios

425 Can't Open Data Connection — Passive Mode Firewall Intermediate

Specifications

RFC 959 File Transfer Protocol (FTP)

RFC 2428 FTP Extensions for IPv6 and NATs

Glossary

Status Code TLS Handshake TCP/IP Three-Way Handshake Port Number Firewall Proxy Server (Forward Proxy) Socket Request-Response Model RFC (Request for Comments) Connection-Oriented Half-Duplex Text vs Binary Protocol FTP Active Mode FTP Passive Mode FTP Control Channel FTP Data Channel SFTP (SSH File Transfer Protocol) FTPS (FTP Secure) FTP Reply Code FTP Anonymous Access FTP Transfer Mode (ASCII vs Binary) FTP Resume (REST Command) SCP (Secure Copy Protocol) FTP Chroot Jail WebDAV (Web Distributed Authoring and Versioning) rsync FTP MLSD (Machine-Readable Listing) FTP NAT Traversal Transfer Integrity FTP over TLS (RFC 4217) File Locking Bandwidth Throttling TLS Versions

Frequently Asked Questions

What is 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 do you see FTP 227 Entering Passive Mode?

After issuing the PASV command. The server switches to passive mode and tells the client where to connect for data transfer.

How to fix FTP 227 Entering Passive Mode?

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.