.NET FTP Library

The .NET FTP Library by Kellerman Software is the ultimate in reliability and performance. You can actually take out the network cable during a transfer, plug it back in and it will resume right where it left off. The component also detects if the FTP Server is shutting down during the middle of your transfer. All the standard FTP operations are supported plus a multitude of other features that help to shorten development time. Transfer files faster by using directory synchronization and MODE Z compression. Securely transfer files over SSL. It also handles SSL with implicit port 990. Inform your users how long the transfer will take using powerful progress statistics.

We also have a component for performing FTP over SSH. An FTP Adapter is included that allows you to use both components from the same interface. Use the discount code FTPANDSFTP to get a discount when purchasing both.

It supports all .NET project types including .NET Framework .NET Core, Mono, Xamarin iOS, Xamarin Mac, Xamarin Android, UWP, Unity, .NET 5, and .NET 6. You can use the .NET FTP Library for C# FTP or VB.NET FTP. Why pay hundreds of dollars more for another FTP Library that is less reliable? Download the full list of features.

While it can be purchased separately, this product is also included in the Gold Suite. Gold Suite subscribers receive all product updates and all new products as part of a yearly subscription. It is the best value in the industry.

Find out about our companion .NET SFTP Component
Buy both FTP and SFTP

Features

How does the .NET FTP Library stack up against the competition?

Download In Excel

Download a free 30 day trial today.

• Full working version
• Includes technical support
• Compatible with Windows, macOS, Linux, iOS, Android and Docker.
• Compatible with .NET Framework 4.5 and higher, .NET Core 2.0 and higher, Mono 5.4 and higher, Xamarin.iOS 10.14 and higher, Xamarin.Mac 3.8 and higher, Xamarin.Android 8.0 and higher, Universal Windows Platform 10.0.16299 and higher, Unity 2018.1 and higher, .NET 5, and .NET 6.

Download Options

• Download Full Installer
• Download Zip No Installer
• Download NuGet Package
• Online Help

The .NET FTP Library requires the following system configuration.

• Compatible with Windows, macOS, Linux, iOS, Android and Docker.
• Compatible with .NET Framework 4.5 and higher, .NET Core 2.0 and higher, Mono 5.4 and higher, Xamarin.iOS 10.14 and higher, Xamarin.Mac 3.8 and higher, Xamarin.Android 8.0 and higher, Universal Windows Platform 10.0.16299 and higher, Unity 2018.1 and higher, .NET 5, and .NET 6.

Kellerman .NET FTP includes a demo with source code in VB.NET and in C#.

Using Kellerman FTP is easy. To transfer files, simply specify the server information and call a transfer method:

FTP ftp = new FTP ();
        // Set the name of the FTP server (its URL)
        ftp.HostAddress = "ftp.fsz.bme.hu" ; // A Hungarian university. change this with your FTP server
        ftp.UserName = "anonymus" ; // Replace with your user name
        ftp.Password = "user@mail.com" ; // Replace with your password
        
        System. Console .WriteLine( "We are downloading the a.txt file. This is a non-blocking call" );
        ftp.DownloadFileAsync( "a.txt" , "a.txt" );
        
        // we wait while this opperation takes place
        while (ftp.IsBusy == true )
        {
        System.Threading. Thread .Sleep(100);
        }
        System. Console .WriteLine( "The maximum speed for downloading a.txt was {0} KBS" , ftp.KiloBytePeak); 

Q: How do I use my license key?
A: FTP ftp = new FTP("my user name","my license key");

Q: I lost my license key how do I retrieve it?
A: Go to your account

Q: I lost my software how do I retrieve it?
A: Go to downloads

Q: Where can I download the latest version of my software?
A: Click the download tab.

Q: Does the FTP libary work with ASP.NET?
A: Yes, the encryption libary works with any .NET project type.

Q: Does the .Net FTP component support FTPS?
A: Yes, Kellerman .NET FTP supports FTPS commonly referred to as FTP/SSL by sending an AUTH_SSL command. It is compliant with the rfc2228 specification.

Q: I want to integrate the objects into my web based backend, is this possible?
A: Yes, you can use the FTP object with an ASP.NET back end, provided the FTP ports are allowed through by the web server firewalls.

Q: My company has 6 servers and 20 websites to synchronize, how does the licensing work? If we buy a license can I distribute it throughout all of our company websites?
A: The FTP .NET component is licensed on a per developer basis. If you are the only developer you may certainly use it on all 20 of your websites.

Q: Our current FTP .NET component has a file size limit of 2GB. What is the file size limit for Kellerman .NET FTP?
A: The file size limit is 9ZB ( Zetabytes).

Q: What happens when the trial expires?
A: An exception is thrown, indicating that the trial is expired.

Q: Is Kellerman FTP compatible with .NET 3.0 and .NET 3.5?
A: Kellerman FTP is compatible with .NET 2.0 and higher.

Q: Is Kellerman FTP compatible with Windows Server 2003?
A: Kellerman FTP is compatible with Windows 98SE, Windows ME, Windows XP, Windows 2000, Windows Server 2000, Windows Server 2003, and Windows Vista.

Q: Is Kellerman FTP thread safe?
A: An instance of Kellerman FTP is required for each thread. Individual instances are thread safe.

Q: Is the directory synchronization feature recursive?
A: Yes, all directories, subdirectories, and files are synchronized.

Q: I am getting the error "Could not resolve host name" how do I fix this?
A: The ASPNET account may not have access to your DNS server. Try using either the internal IP Address or external IP address of the FTP Server.

Q: Active connections only work once without recycling app pool, how do I fix this?
A: Windows Firewall is blocking your connection. Configure the firewall to allow the FTP communication through.