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SSH is the broad secure remote-access protocol; SFTP is a file-transfer service that runs through SSH. Use SFTP when you only need to upload, download, rename, or edit website files. Use SSH when the job requires a shell command, deployment script, log inspection, process management, permission changes, package installation, database tooling, or network forwarding. SFTP can be configured without granting an interactive shell, while an ordinary SSH account may provide much wider server access. The safest choice is therefore the narrowest service that can complete the task.
SFTP and SSH at a glance
| Decision area | SSH | SFTP |
|---|---|---|
| Primary purpose | Secure remote login, command execution, administration, and network forwarding | Secure remote file transfer and file management |
| Typical interface | Interactive shell, one-off command, script, or forwarded connection | File-transfer client, batch file, or file-management commands |
| Website examples | Run a build, inspect logs, restart a service, change ownership, run database commands | Upload a theme, download a backup, create a directory, rename a release file |
| Possible access scope | Broad server control, depending on account privileges and enabled forwarding | Can be restricted to file operations and a directory or chroot |
| Encryption and authentication | Provided by the SSH transport and the server’s authentication policy | Uses the SSH transport and its authentication policy |
| Least-privilege default | Use only when shell or server controls are required | Prefer for file-only access |
These are not competing encryption technologies. In a typical OpenSSH installation, SFTP is an SSH subsystem. Both can use public-key authentication, and both inherit the server’s decisions about accounts, ports, host keys, directory permissions, and forwarding.
What SSH is
SSH, or Secure Shell, is a protocol for secure remote login and other secure network services across an untrusted network. The protocol is defined in three conceptual layers:
- Transport: authenticates the server, provides confidentiality and integrity, and can optionally compress traffic.
- User authentication: proves the identity of the account using a password, public key, or another method permitted by the server.
- Connection: carries one or more logical channels inside the encrypted connection.
The connection layer is why SSH is more than a remote command prompt. It supports interactive login sessions, one-off remote commands, forwarded TCP/IP connections, and forwarded X11 connections. Several channels can be multiplexed through one encrypted tunnel.
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OpenSSH is a widely used implementation suite rather than a separate protocol. Its client-side tools include ssh, scp, and sftp. Server-side components include sshd and sftp-server; ssh-agent holds private-key operations on the client. Utilities such as ssh-keygen, ssh-add, and ssh-keyscan support key creation, agent management, and host-key collection.
What an SSH session can do for a website
Once an account has the necessary authorization, an SSH session can run a deployment command, execute a build tool, read application and web-server logs, inspect disk space, restart a process, install a dependency, alter file ownership, or invoke a database client. Those capabilities are useful for administration but create a larger impact if credentials are stolen or the account is misconfigured.
What SFTP is
SFTP stands for SSH File Transfer Protocol. In OpenSSH, the sftp client asks sshd to start the sftp-server subsystem (or an equivalent internal implementation). The resulting service performs file operations over the already encrypted SSH transport.
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An SFTP client looks somewhat like an FTP client, but it is not traditional FTP protected by a separate add-on. It is a distinct file-transfer protocol carried through SSH. Common operations include listing directories, changing directories, uploading and downloading files, creating directories, renaming items, deleting files, and changing selected attributes when the account is allowed to do so.
A server can configure an account for SFTP-only access. In that arrangement, the user still authenticates through SSH, but the server starts the file-transfer subsystem instead of a shell. The account may also be confined to a chroot directory so that its visible filesystem begins at the website’s designated root.
How SFTP and SSH relate on a server
- The client connects to the host and the SSH service port selected by the administrator.
- The SSH transport verifies the server’s host key and negotiates encryption and integrity protection.
- The user authenticates with a permitted method, such as a password or private key.
- An SSH connection channel is opened for the requested service.
- For SFTP, the server starts the SFTP subsystem. For ordinary SSH, it starts a shell or runs the requested command.
Because SFTP normally uses the SSH service, it commonly uses the same configured port. Many installations use port 22, but a hosting provider can select another port, and a firewall or policy can expose different services on different ports. Ask the provider for the hostname, port, username, authentication method, and starting directory rather than assuming any of these values.
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Feature differences that matter for website management
Purpose and interface
SSH gives you a command channel. You can type commands interactively or send one command from your local machine. SFTP gives you a file-management channel. It is designed around paths and file operations rather than a general operating-system prompt.
Access scope
An SSH account can be limited, but an unrestricted account may expose the shell, local utilities, environment variables, and forwarding features. SFTP can be configured to expose only a website directory and file operations. This difference is an operational least-privilege recommendation, not a guarantee: account groups, filesystem permissions, chroot settings, forced commands, and hosting-provider policy determine the actual boundary.
Automation
Both tools support automation, but the unit of automation differs. An SFTP batch file can upload a known set of files or create directories. SSH can run a deployment script that checks out a release, builds assets, migrates a database, switches a symlink, and restarts an application. A file-transfer client cannot substitute for commands that must execute on the server.
Forwarding and tunnels
SSH can carry forwarded TCP/IP connections and, where enabled, X11 forwarding. These features are useful for administration and private service access, but they are unnecessary for a user who only needs to publish files. An SFTP-only account can have forwarding and terminal allocation disabled.
Permissions and ownership
SFTP can create or modify files only within the permissions granted to the account. It does not magically bypass Unix ownership or access-control rules. SSH is needed when you must run an authorized chmod, chown, service command, or hosting-specific administrative tool. Those commands may require a different account or elevated privileges.
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Uploading or replacing site files
Choose SFTP when the task is limited to copying files into the web root, replacing an image, uploading a plugin or theme archive, or downloading a backup. The narrower interface reduces the chance of accidentally running a destructive command and allows a provider to issue file-only credentials.
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Editing configuration or application files
SFTP is suitable for transferring a carefully edited file, provided the account can write to that directory. Use a local editor and upload a validated copy rather than editing production files blindly. If the change also requires a service reload, cache purge, migration, or environment update, the complete task needs SSH or a provider’s separate control panel.
Deploying an application
Use SSH when deployment involves a script, dependency installation, asset compilation, database migration, release directory, symlink switch, queue restart, or health check. SFTP can deliver an already-built artifact, but it cannot execute the server-side steps unless another deployment mechanism performs them.
Reading logs and diagnosing failures
Use SSH for commands such as tail, less, service-status checks, disk inspection, and process queries. SFTP can download a log that the account is allowed to read, but it cannot filter a live stream or inspect running processes.
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Managing permissions, services, and packages
These are SSH tasks. File-transfer access alone cannot install a package, restart a web server, change ownership across a tree, or alter a system service. The provider may prohibit some of these actions even after SSH access is granted.
Using SFTP safely: a practical workflow
Gather the connection details
- Hostname or IP address supplied by the host
- SSH/SFTP port, including any custom value
- Username and the permitted authentication method
- Private-key path, if key authentication is used
- Website directory or chroot starting point
- Whether the account is read-only or can write, rename, and delete
Connect from a terminal
For a standard port, the command is:
sftp user@example.comFor a custom port, use an uppercase -P:
sftp -P 2222 user@example.comTo select a private key explicitly:
sftp -i ~/.ssh/site_ed25519 -P 2222 user@example.comThe first connection may display the server’s host-key fingerprint. Verify it through a trusted provider channel before accepting it. A changed fingerprint later can indicate a legitimate server replacement, but it can also signal interception; stop and verify instead of automatically accepting the new key.
Transfer and organize files
pwd # show the remote working directory
lpwd # show the local working directory
ls # list remote files
cd public # change remote directory
lcd ~/site-build # change local directory
put index.html # upload one file
put -r assets # upload a directory recursively
get backup.zip # download one file
mkdir releases # create a remote directory
rename old.html new.html
rm old-backup.zip
byeUse a temporary filename for a large or critical upload, verify its size, and rename it into place only after the transfer completes. This prevents visitors from receiving a partially uploaded file. Preserve a backup before replacing configuration or application files, and confirm that the destination path is the intended release directory.
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Use batch mode for repeatable transfers
An SFTP batch file can contain commands such as cd, lcd, put, and rename. Run it with:
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Using SSH for server-side work
Start a shell or run one command
ssh user@example.comssh -p 2222 user@example.com 'tail -n 100 ~/logs/app.log'The exact log path and available commands depend on the operating system and hosting plan. Treat copied commands as examples and confirm paths with the provider.
Typical administrative sequence
- Connect with the least-privileged account that can perform the task.
- Inspect the current release, disk space, service state, and recent logs.
- Run the deployment or maintenance command from a known directory.
- Validate the result with an HTTP check, application health command, or log review.
- Restart only the service that needs restarting, if policy permits it.
- Record the release or configuration change so it can be reversed.
Do not paste private keys, passwords, or untrusted scripts into a shell. Review commands that delete files, alter ownership, modify firewall rules, or restart production services before executing them.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you use SSH without giving shell access?
Yes. SSH is the transport and authentication framework; a server administrator decides which service an account may request. OpenSSH can force an account to run an internal SFTP service, set a ChrootDirectory, disable terminal allocation with PermitTTY no, and disable forwarding with settings such as AllowTcpForwarding no and X11Forwarding no. A forced command can also replace a normal shell with a narrowly defined operation.
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Security practices for either method
Prefer keys where supported
Public-key authentication avoids sending a reusable password during each login and supports separate keys for separate people or systems. Protect the private key with a strong local passphrase, restrict its file permissions, and remove or rotate keys when a person, device, or deployment system no longer needs access.
Verify the host key
Host-key verification confirms that the client is connecting to the expected server. Record the verified fingerprint through a trusted channel. Do not suppress warnings simply to make an automated job continue.
Limit the account
- Grant access only to the required website directory.
- Use an SFTP-only service when shell commands are unnecessary.
- Disable forwarding and terminal access for file-only accounts.
- Use a chroot or equivalent confinement where the provider supports it.
- Separate human administration keys from automated deployment keys.
- Grant write permission only where publishing actually occurs.
Protect the transport and endpoint
SSH and SFTP encrypt traffic in transit, but encryption does not make a compromised endpoint safe. Keep the local computer, client software, and private keys protected. Use the provider’s required port and firewall rules, and avoid placing credentials in shell history, shared documents, or publicly readable automation files.
SFTP, SSH, and SCP: an important version detail
OpenSSH 9.0 changed the scp command to use SFTP by default instead of the legacy scp/rcp protocol. Older scripts may rely on legacy wildcard expansion or other behavior that differs from SFTP. Review automated copy jobs when upgrading OpenSSH, test filename patterns containing spaces or special characters, and select an explicit compatibility option only when you understand the security and behavior implications.
Does SFTP use the same port as SSH?
Usually, yes: SFTP normally requests a subsystem from the SSH service listening on its configured port. The port is not inherent to the SFTP name, however. A provider can use a custom SSH port, proxy the service, or impose a separate access policy. If an SFTP client times out while an SSH client works, compare the hostname, port, firewall rules, and account restrictions rather than changing encryption settings at random.
Common problems and fixes
| Symptom | Likely cause | What to check |
|---|---|---|
| Connection refused | Wrong port, stopped SSH service, or firewall rejection | Confirm the provider’s current port and whether your address is allowed |
| Permission denied during upload | The account lacks write permission or the path is outside its chroot | Start from the account’s reported directory and ask which folder is writable |
| Authentication fails | Wrong username, key, passphrase, or authentication method | Check the selected identity file and whether the public key is installed for that account |
| SFTP works but SSH shell fails | The account is intentionally SFTP-only | Request a separate administrative account if command access is legitimately required |
| SSH works but SFTP subsystem fails | The subsystem is disabled, misconfigured, or unavailable on the plan | Ask the provider to confirm its SFTP subsystem and account policy |
| Files upload but the site still shows old content | Wrong document root, cache, permissions, or application release path | Verify the remote path, ownership, cache behavior, and active release configuration |
| Host-key warning appears after a server change | Legitimate replacement or possible interception | Verify the new fingerprint through a trusted channel before updating the local record |
What is safer for a WordPress or other website?
For routine file publishing, SFTP is generally the safer operational choice because an administrator can issue credentials that expose file operations without an interactive shell. That does not make every SFTP account harmless: a writable web root can still be abused to replace application code, and a user with permission to delete files can damage a site.
Use SSH for maintenance that genuinely needs server commands, such as examining live logs, running a documented deployment, changing ownership, or invoking server-side tooling. Keep that access separate from ordinary content editors when possible. For either method, use individual accounts or keys, verify the host, limit directory permissions, and revoke access when the work ends.
A decision checklist
- Only moving website files? Choose SFTP.
- Need a shell command, script, log stream, process action, package, migration, or permission change? Choose SSH.
- Need file access but no shell? Ask for an SFTP-only account with chrooting and forwarding disabled.
- Unsure which directory or port applies? Confirm the provider’s exact hostname, port, starting directory, and permissions.
- Automating transfers? Use key authentication, verify host keys, test batch behavior, and add a rollback plan.
- Changing from older SCP scripts? Test them against the SFTP behavior used by OpenSSH 9.0 and later.
The practical verdict
SFTP is the focused tool for website file access; SSH is the broader tool for remote administration. They normally share SSH’s encrypted transport and authentication, but they do not grant the same capabilities. Select SFTP for least-privilege publishing and SSH only when the work requires server-side commands or controls. Your hosting provider’s account configuration ultimately determines the port, directory boundary, authentication methods, shell availability, and forwarding rights.
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