FTP

150 File Status OK

The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.

On this page

When You See This Code

Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.

How to Fix

No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection.

Specification

View RFC / Specification →

Compare With

110 Restart Marker Reply 120 Service Ready Soon 125 Data Connection Open 200 Command OK 202 Command Superfluous 211 System Status 212 Directory Status 213 File Status 214 Help Message 215 System Type 220 Service Ready 221 Closing Control Connection

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

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 150 File Status OK?

The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.

When do you see FTP 150 File Status OK?

Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.

How to fix FTP 150 File Status OK?

No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection.