SFTP for .NET

Provides high-performance SFTP (FTP over SSH) file transfer functionality. Built to be efficient, interoperable, and secure. Provides an easy to use and flexible API. Backed by a responsive support and development team whose sole ambition is your complete satisfaction.

Works with most SFTP server types, supports all major SFTP operations
Efficient, RFC-compliant implementation of SFTP protocol
Supports .NET 4.5, 5, 6 and 7 (including .NET core and .NET Standard)

A reliable and efficient implementation of the SSH File Transfer Protocol (SFTP). Deliver the level of security that applications now require.

Interoperable

Works with most SFTP servers by implementing version 3 and 6 of the SFTP protocol, SSH-2, and a variety of protocol modes such as counter mode encryption. Works with most proxy servers through HTTP, SOCKS4/4A and SOCKS5.

Flexible API

Powered by Xceed’s intuitive file- and folder-based FileSystem Core object model, which meshes perfectly with the design of the SFTP protocol, it allows you to easily add secure remote file operations to your .NET applications. It also lets you quickly and easily integrate use of Xceed Zip for .NET for efficient data compression or decompression before sending or receiving files.

Trusted

Xceed SFTP for .NET has been in commercial use for 3 years, and is resolutely supported and updated. It is used by Microsoft in an important application, and is made by a team with 15 years experience building and supporting .NET libraries for developers.

Securely sends and receives files, folders or entire directory structures quickly and easily.
Securely sends and receives files to or from disk or memory streams.
Obtain a detailed listing of files and folders. Create, rename, and delete files and folders on the SFTP server using SFtpFile and SFtpFolder’s properties and methods. All without the need to maintain and monitor a “current working directory”.
Flexible synchronization of any number of folders and files of any type (FileSystemItem and FileSystemItem-derived objects, such as AbstractFile or AbstractFolder objects and their derivatives), wherever they are located.
Can use established filters (name, date, attributes, size) to select files for listing, sending or receiving. Or create your own to fit a specific criteria.
Allows a destination file or folder to have a different name than the source when transferring files.
SFTP activity can be logged to disk, console or any System.IO.TextWriter object.
Can set a timeout limit on all operations and have an exception triggered if it is exceeded.
Triggers an event if the connection to the SFTP server is lost.
Accepts SFTP server by IP address or host name.
Supports wildcard in files to send or receive.
When sending multiple files and an error occurs, allows you to retry the file, skip it and continue, or abort the entire operation.

Complies with RFC 4253, 4252, and 4254.
Implements the SSH-2 protocols. This means that data exchanges with the server use strong encryption and data integrity checks. Encryption keys are exchanged in a secure manner and are automatically changed periodically during a session.
Implements versions 3 and 6 of the SFTP protocol. Versions 4 and 5 are not supported but automatic fallback to version 3 works with most servers
Items from the SFTP server are represented by SFtpFile and SFtpFolder objects, allowing them to be manipulated like regular files and folders. These classes integrate with Xceed’s FileSystem component.
Unlike FTP, SFTP enforces a precise date and time format (down to the second for version 3 servers and down to the nanosecond for version 6 servers). This makes it easy and consistent to determine the freshest file between client and server machines.
Supports HTTP, SOCKS4/4A and SOCKS 5 proxy servers.
Efficient flow control.
Supports encryption methods based on the counter mode of operation (aes256-ctr, etc) for increased interoperability.
Also supports arcfour encryption algorithms.
Specify which network adapter to connect from if the system is using multiple network adapters.100% managed code written in C#. Source code available through a Blueprint subscription.

Securely sends and receives files, folders or entire directory structures quickly and easily.
Securely sends and receives files to or from disk or memory streams.
Obtain a detailed listing of files and folders. Create, rename, and delete files and folders on the SFTP server using SFtpFile and SFtpFolder’s properties and methods. All without the need to maintain and monitor a “current working directory”.
Flexible synchronization of any number of folders and files of any type (FileSystemItem and FileSystemItem-derived objects, such as AbstractFile or AbstractFolder objects and their derivatives), wherever they are located.
Can use established filters (name, date, attributes, size) to select files for listing, sending or receiving. Or create your own to fit a specific criteria.
Allows a destination file or folder to have a different name than the source when transferring files.
SFTP activity can be logged to disk, console or any System.IO.TextWriter object.
Can set a timeout limit on all operations and have an exception triggered if it is exceeded.
Triggers an event if the connection to the SFTP server is lost.
Accepts SFTP server by IP address or host name.
Supports wildcard in files to send or receive.
When sending multiple files and an error occurs, allows you to retry the file, skip it and continue, or abort the entire operation.

Product Updates

Here are all the latest updates to this product

Version 7.3

Release Date: September 8th, 2025

Build Number: 7.3.25458.6687

Included in this release:

It is now possible to use the curve25519-sha256 and curve448-sha512 key exchange algorithms.
It is now possible to use the ssh-ed25519 and ssh-ed448 public key algorithms.
A total of 4 new features were implemented in this release.

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Version 7.2

Release Date: April 28th, 2025

Build Number: 7.2.25228.5775

Included in this release:

SFTP for NET now offers a new build compatible with.NET 5.0 & later.

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Version 7.2

Release Date: February 3rd, 2025

Build Number: 7.2.25103.5775

Included in this release:

This release adds timestamps to trace log entries.
Three new properties, named SSHClient.TraceWriterTimestampFormat, SSHClient.TraceWriterTimestampFormatProvider & SSHClient.TraceWriterTimestampUTC were added to allow deeper customization.
This release adds the HighSecurityDataIntegrityMethods & HighSecurityEncryptionMethods algorithm sets.
SFTP for .NET now supports RFC8308: Extension Negotiation in the Secure Shell (SSH) Protocol.
Support was added for a few more algorithms, like Encrypt-then-MAC algorithms, as well as hmac-sha2-256-etm@openssh.com, hmac-sha2-512-etm@openssh.com & hmac-sha1-etm@openssh.com algorithms.
The negotiation priorities of high security key exchange & public key algorithms have been improved.
A total of 11 bug fixes & improvements were added with this release.

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Version 7.1

Release Date: Released Mar. 4, 2024

Build Number: Build 7.1.24152.2253

Included in this release:

The exception information included in the trace log now includes additional information coming from Exception.Source & Exception.Data whenever this information is available.
In total, 2 bug fixes are included with this service release.

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Version 7.1

Release Date: Released Oct. 25, 2023

Build Number: Build 7.1.23524.1212

Included in this release:

SFTP for .NET now correctly handles SSH_MSG_GLOBAL_REQUEST messages from the server.
SFtpSession now automatically stays with version 3 of the SFtp Protocol instead of going straight to the highest version by default.
This release also fixes a bug where AbstractFolder.CopyItemsTo() and MoveItemsTo() incorrectly included themselves in the operation, causing an exception in some situations.

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Version 7.1

Release Date: Released Oct. 5, 2022

Build Number: Build 7.1.22505.444

Included in this release:

Small fixes were made so that the component would work well with the new version of Zip for .NET.

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Version 7.0

Release Date: Released Jul. 19, 2021

Build Number: Build 7.0.21365.13460

Included in this release:

Added support for ssh-ecdsa-sha2-* private keys in PuTTYPrivateKeyFile class, allowing to authenticate (login) with ECDSA certificates.
Added AES Galois Counter Mode (aes128-gcm and aes256-gcm) encryption support.
Added support for elliptic curve Secp256k1 (ecdsa-sha2-1.3.132.0.10) in key exchange method and public key algorithm.
Added support for elliptic curve Nistp521 (ecdsa-sha2-nistp521) in key exchange method and public key algorithm.
Fixed a bug where the “Diffie Hellman elliptic curve” key exchange was not secure enough.
Fixed a bug where using elliptic curve public key algorithms to connect failed in certain situations.

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Version 6.9

Release Date: Released Jan. 25, 2021

Build Number: Build 6.9.20211.01251

Included in this release:

Assembly names and .dll files no longer have their version number as part of the name, simplifying the update process for applications.

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Version 6.8.1

Release Date: Released Aug. 17, 2020

Build Number: Build 6.8.20412.20130

Included in this release:

Interoperability improvement: Added new key exchange methods: diffie-hellman-group14-sha256, diffie-hellman-group15-sha512, diffie-hellman-group16-sha512.

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Version 6.8

Release Date: Released Jan. 30, 2020

Build Number: Build 6.8.20078.14200

Included in this release:

This release adds support to “rsa-sha2-256”, “rsa-sha2-512” and “ecdsa-sha2-nistp384” public key algorithms. Xceed SFTP for .NET keeps up with the trend for SSH servers to remove old and deficient algorithms and only support newer ones. Moreover, the rsa-sha2 algorithms use the more secure SHA-2 signature methods over the original SHA-1 for client-server authentication, and are used by default when connecting to SSH servers. Note that “ecdsa-sha2- nistp384” is added to the already supported “ecdsa-sha2-nistp256”, and that older security algorithms are still supported to maintain as much interoperability as possible.
When connecting to a SSH server, the server’s host key is now provided as an SHA256 hash value, not just an MD5 one, making application code simpler if stored values are in this format.

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Version 6.7

Release Date: Released Jan. 30, 2019

Build Number: Build 6.7.19076.18060

Included in this release:

Added a port .NET standard 2.0 and above
Fixed a timeout that occurred on certain servers when the component would not wait for an empty remote data window to be adjusted when uploading data.

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Version 6.6

Release Date: Released Jun. 18, 2018

Build Number: Build 6.6.18314.13140

Included in this release:

The flow control (local window) is no longer updated twice for each received packet.
No changes to the corresponding .NET 2.0 / .NET 3.5 version, which is v4.9, found within Xceed Components package build 4.6.15607.15601 containing select bug fixes only.

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