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SFTP and FTPS are separate protocols, not two names for the same kind of “secure FTP.” SFTP is the SSH File Transfer Protocol. FTPS adds TLS security extensions to the older FTP protocol. A client and server must use the same protocol family.
What is the difference between SFTP and FTPS?
| Area | SFTP | FTPS |
|---|---|---|
| Underlying protocol | SSH transport with the SSH File Transfer Protocol | FTP plus TLS and FTP security extensions |
| Typical service port | TCP 22 for SSH (the server may be configured differently) | FTP control commonly uses TCP 21 for explicit TLS; Microsoft’s implicit FTPS extension uses TCP 990. Data ports depend on server and mode. |
| Connections | File operations run through the SSH connection | FTP has a control connection and separate data connections |
| Identity model | SSH host-key verification and user passwords, keys, certificates, or other SSH-supported methods | TLS certificate validation plus FTP credentials or another server-defined authentication method |
| Firewall concern | Often one permitted SSH service is operationally simpler | Control and data channels, passive/active mode, NAT, and a defined data-port range must all work |
| Compatibility driver | Best when both endpoints provide SFTP over SSH | Best when a counterparty or installed FTP workflow requires FTP/TLS |
FTP’s control/data design comes from the model specified in RFC 959. RFC 4217 describes adding TLS and FTP security extensions, while RFC 4253 specifies SSH transport protection. These standards describe capabilities, not a guarantee that a particular deployment has been configured correctly.
How SFTP security works
One SSH transport
SFTP normally operates inside an SSH session. SSH negotiates algorithms, encrypts traffic, authenticates the server, and protects message integrity. SSH normally listens on TCP port 22, although administrators can choose another port.
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Host-key verification is essential
On a first connection, the client receives the server’s SSH host key. Verify that key through a trusted channel before accepting it. A warning about a changed key can indicate a legitimate server rebuild, but it can also indicate a man-in-the-middle attack; do not bypass the warning without investigation.
Use a deliberate credential policy
For automated transfers, an individual key restricted to the job is usually easier to revoke and audit than a shared password. Limit the account’s directory access and permissions, rotate keys according to your policy, and protect private keys in a secret store or restricted service account. SFTP itself does not decide these operating-system permissions.
How FTPS security works
Explicit and implicit modes
Explicit FTPS starts with the FTP service and negotiates TLS on the control connection; TCP 21 is the conventional FTP control port. Implicit FTPS expects TLS from the beginning. Microsoft’s FTPS extension documentation describes implicit service use on TCP 990, but 990 is not the universal FTPS port and does not describe every deployment.
Protect both channels
FTPS has a control connection and separate data connections. A configuration can encrypt the control channel while leaving data-channel protection optional or incorrectly negotiated. Require the server’s stated policy for protected data transfers, and verify that the client fails safely when that policy cannot be met.
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Validate the certificate and hostname
Check the certificate chain, expiration, hostname, and trust anchor rather than merely enabling a “secure” checkbox. Decide how the client handles expired, self-signed, or mismatched certificates. Disabling validation removes the identity check that TLS is supposed to provide.
Which protocol is more secure?
There is no universal winner. Correctly configured SSH supplies encryption, server authentication, and integrity; correctly configured FTPS can provide authentication, confidentiality, and integrity through TLS and FTP security extensions. Weak algorithms, unverified peers, shared credentials, excessive account privileges, or an unprotected FTPS data connection can undermine either choice.
Ask these questions instead of comparing labels:
- Does the client validate the server’s SSH host key or TLS certificate?
- Are current, organization-approved cryptographic algorithms enabled?
- Are passwords, keys, and certificates stored and rotated safely?
- Does FTPS protect the data connection as well as the control connection?
- Are failed identity checks rejected rather than silently bypassed?
- Are accounts restricted to the directories and operations they need?
Firewall, NAT, and port planning
Why SFTP is often simpler
With SFTP, a firewall commonly needs to permit one SSH service and its return traffic. That can reduce the number of moving parts, but it is only a tendency. Nonstandard SSH ports, jump hosts, inspection devices, and restrictive outbound policies can still require substantial work.
Why FTPS needs a connection plan
FTP’s separate data connections must be reachable through firewalls and NAT. Passive mode normally requires the server to advertise a defined range of data ports and for that range to be permitted. Active mode creates a different direction of connection and may be blocked by client-side firewalls. Encrypted FTP traffic can also confuse legacy firewall filters that expect to inspect unencrypted FTP commands. Document the chosen mode, control port, passive data-port range, NAT addresses, and TLS policy before production.
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Choose SFTP when
- The partner explicitly supports SFTP and permits SSH.
- Your operations team already manages SSH host keys and user keys.
- A single service connection is easier to approve than FTP control and data ranges.
- Your automation, monitoring, and account isolation are designed for SSH-based transfers.
OpenSSH is a free, open-source implementation that provides SFTP client and server support. Confirm the exact platform package and server configuration; do not assume every operating system ships identical SFTP support.
Choose FTPS when
- A customer, regulator, or legacy application requires FTP with TLS.
- Your installed tooling supports the required explicit or implicit mode and certificate policy.
- Your network team can operate the control and data ports through firewalls and NAT.
- The counterparty has supplied its certificate, authentication, and data-channel requirements.
When the other side has not specified anything
Ask for the exact protocol name, explicit or implicit mode, control port, passive or active behavior, data-port range, certificate or host-key verification method, authentication type, and minimum cryptographic settings. Do not select a protocol from the vague phrase “secure FTP.”
A practical selection procedure
- Inventory both endpoints. Record supported protocol families, client libraries, server products, operating systems, and authentication methods.
- Confirm the partner’s requirement. A protocol mismatch cannot be solved by changing a port number.
- Map the network. Draw client, server, firewall, NAT, proxy, and inspection paths. For FTPS, include every data connection.
- Define identity checks. Pin or record SSH host keys, or specify TLS trust chains and hostname validation.
- Set cryptographic policy. Disable obsolete algorithms and require encryption for the data channel where FTPS is used.
- Design least-privilege accounts. Restrict directories, commands, upload/download rights, and retention access.
- Test failure behavior. Change a host key, present an invalid certificate, block a data port, and expire a credential in a non-production test. The client should fail clearly.
- Monitor and document. Keep transfer logs, authentication events, key or certificate expiry dates, retry behavior, and an owner for each integration.
Performance, reliability, and cost considerations
The available standards and documentation do not establish a universal speed advantage for either protocol. Throughput depends on latency, encryption implementation, file sizes, concurrency, disk speed, server limits, and network policy. Benchmark your own workload if transfer time matters.
Reliability is usually determined by the surrounding system: resumable-transfer support, retries, idempotent filenames, atomic rename practices, timeouts, and alerting. Test large files, many small files, interrupted connections, duplicate deliveries, and partial uploads. Keep temporary uploads out of the directory consumed by downstream jobs.
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- Multiple users with multiple paths
Both protocols can be implemented with free software, including OpenSSH for SFTP. Budget instead for administration, certificate or key lifecycle work, firewall changes, monitoring, and partner support. A managed service may reduce operational effort, but the right choice depends on requirements not established here.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common failures
“Connection refused” or timeout
For SFTP, verify the SSH hostname, configured port, listener, and firewall rule. For FTPS, test the control port first, then the negotiated data connection and passive range. A reachable control channel does not prove that FTPS transfers will work.
Host-key or certificate warning
Stop and verify the change with the server owner. For SFTP, compare the new host-key fingerprint through a trusted channel. For FTPS, inspect the certificate chain, hostname, expiry, and trust store. Never make acceptance warnings disappear by disabling verification.
Login succeeds but directory listing or upload fails
Check account permissions and chroot or home-directory rules. With FTPS, inspect data-channel protection and passive/active negotiation. With SFTP, confirm that the account is allowed to start the SFTP subsystem and access the requested path.
Best Value
- Wireless File Transfer
- Full functional SSH Server
- SFTP File Transfer
- Protect USB charging port
- Multiple users with multiple paths
Transfers fail only through a corporate firewall
Capture the negotiated ports and mode with approved diagnostics. Ask the network team to permit the documented SFTP service or FTPS control and passive data ranges. Legacy FTP inspection can interfere with encrypted sessions; use a policy-aware inspection configuration rather than weakening TLS.
Automation works manually but not in a job
Compare the runtime user, key or certificate store, known-hosts file, environment variables, working directory, timeout, and proxy settings. Ensure the job rejects identity changes and records the remote response, exit status, and transfer ID.
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