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Also known as: FTP over TLS
An extension of FTP that secures control and data channels using TLS, supporting explicit and implicit encryption modes.
DESCRIPTION
FTPS (FTP Secure) adds TLS encryption to the File Transfer Protocol, protecting authentication and data in transit. Two modes exist: explicit FTPS negotiates TLS via commands, while implicit FTPS assumes TLS from connection start. FTPS supports certificate-based authentication and can meet compliance requirements for encrypted data transfers. Compared to SFTP (SSH File Transfer Protocol), FTPS uses TLS and traditional FTP semantics, which can complicate firewall configurations. It’s common in enterprise integrations and managed file transfer solutions.
ALTERNATIVE DEFINITIONS
IETF RFC 4217
This document specifies how to provide Secure File Transfer Protocol (FTP) over Transport Layer Security (TLS).
Formal standard specifying FTPS mechanisms and negotiation.
Microsoft Learn
FTP over SSL (FTPS) is an extension to FTP that adds support for Transport Layer Security (TLS), encrypting the control and data channels.
Explains explicit and implicit FTPS configurations within IIS.
AWS Transfer Family
FTPS uses TLS to secure FTP connections, providing encryption for data and authentication; AWS Transfer Family supports FTPS endpoints.
Vendor support context within managed transfer services.
RELATED TERMS
TLS SSL/TLS Certificates Explicit FTPS Implicit FTPS IETF RFC 4217 Data Encryption Firewall Port 21
COMPETING TERMS
KNOWLEDGE AREAS
Data Integration & Interoperability Data Security Infrastructure Cloud
TARGET AUDIENCE
Data Engineer DevOps Engineer Security Architect Cybersecurity Engineer Application Administrator Solution Architect
EXTERNAL SOURCES
- Wikipedia - FTPS
- IETF - Official FTPS specification
- Microsoft - Configuration guide for FTPS on IIS
- AWS - FTPS support in AWS Transfer Family
TOP QUESTIONS
What is FTPS?
FTPS secures the traditional FTP protocol with TLS, encrypting authentication and data channels to protect information in transit.
Category: Definition
How does FTPS differ from SFTP?
FTPS uses TLS and FTP semantics; SFTP uses SSH with a different protocol. FTPS can be harder to firewall due to multiple ports.
Category: Distinction
What are explicit and implicit FTPS?
Explicit FTPS negotiates TLS via commands; implicit FTPS assumes TLS immediately upon connection. Many modern systems prefer explicit mode.
Category: Concept
When should I choose FTPS over SFTP?
Use FTPS if existing systems require FTP commands or certificate-based policies. Choose SFTP for simpler firewalling and SSH-based ecosystems.
Category: Opinion
What are common FTPS configuration mistakes?
Mismanaging certificates, neglecting passive port ranges in firewalls, or failing to enforce TLS version/cipher policies weakens security.
Category: Mistakes
What compliance considerations apply to FTPS?
Ensure strong TLS versions, secure ciphers, certificate management, and detailed logging to satisfy regulatory and audit requirements.
Category: Requirements
How is FTPS managed in the cloud?
Managed services like AWS Transfer Family and Azure support FTPS endpoints, simplifying certificates, scaling, and security configurations.
Category: Management
What is the biggest misunderstanding about FTPS?
Some assume FTPS and SFTP are interchangeable; they differ in protocol stacks, tooling, and network behavior.
Category: Misunderstanding
How to troubleshoot FTPS connectivity?
Verify certificates, passive port ranges, TLS negotiation, and firewall/NAT settings. Use verbose logs for handshake diagnostics.
Category: Process