Major release with lots of new and exciting features, and numerous fixes by our contributors. Thanks everyone!

20.0.0

• New: FTP Server software detection (PureFTPd, VsFTPd, ProFTPD, FileZilla, OpenVMS, WindowsCE, WuFTPd)
• New: Detect if the FTP server supports recursive file listing (LIST -R) command using whitelist
• New: GetListing will manually recurse through directories if FtpListOption.Recursive is set and server does not support recursion
• New: Added LastReply property which returns the last FtpReply recieved from the server.
• New: Added new upload option AppendNoCheck to append to a file on the server without checking if it exists (thanks @everbalovas)
• Fix: During upload, respond to any error in 5xx series, not just 550 (thanks @stengnath)
• Fix: Various fixes to UploadFileAsync based on fixes already implemented in UploadFile

19.2.4

• Fix: UploadFilesAsync with errorHandling deletes the entire directory instead of specific files
• Fix: Server responds to EPSV with 425 "Data connection failed" but connects with PASV (thanks @ejohnsonTKTNET)
• Fix: Use proper async configuration for .NET Async methods (thanks @ejohnsonTKTNET)
• Fix: Improve implementation of upload and download resuming in Async methods (thanks @ejohnsonTKTNET)

19.2.3

• Fix: UploadFile() or UploadFiles() sometimes fails to create the remote directory if it doesn't exist
• Fix: DownloadDataType Binary value ignored on ASCII-configured FTP servers
• Performance improvement: Added BufferedStream between SslStream and NetworkStream (thanks @Lukazoid)
• Fix: When the FTP server sends 550, transfer is received but not confirmed (thanks @stengnath)
• Fix: Make Dispose method of FTPClient virtual (thanks @martinbu)
• Fix: OpenPassiveDataStream/Async() uses the target FTP host instead of the configured proxy (thanks @rmja)
• Fix: FileExists() for Xlight FTP Server (thanks @oldpepper)
• Fix: FTPD "550 No files found" when folder exists but is empty, only in PASV mode (thanks @olivierSOW)
• Fix: Many unexpected EOF for remote file IOException on Android (thanks @jersiovic)
• Fix: Race condition when BeginInvoke calls the callback before the IAsyncResult is added (thanks @Lukazoid)

19.2.2

• Fix: Prevent socket poll from hammering the server multiple times per second
• Fix: Allow using absolute paths that include drive letters (Windows servers)
• Performance improvement: Only change the FTP data type if different from required type
• Performance improvement: Download all files in EOF mode and skip the file size check, unless download progress is required
• Added all missing async versions of FTP methods to IFtpClient
• System: Certain core FTP socket handling operations have been changed to improve reliability & performance.

19.1.4

• Fix: Fix hang in TLS activation because no timeout is set on the underlying NetworkStream (thanks @iamjay)

19.1.3

• Added async versions of FTP methods to IFtpClient (thanks @peterfortuin)
• Fix: Fixes when ActivePorts is specified in active FTP mode (thanks @ToniMontana)
• Fix: Throw OperationCanceledException instead of FtpException when cancellation is requested (thanks @taoyouh)

19.1.2

• Fix: Add support for checking if file exists on Serv-U FTP Server
• Fix: Make IFtpClient inherit from IDisposable (thanks @repl-andrew-ovens)
• (UWP) Fix: UWP does not allow File.Exists() to run in UI thread (thanks @taoyouh)

19.1.1

• Fix: When downloading files in ASCII mode, file length is unreliable therefore we read until EOF
• Fix: When upload/download progress is indeterminate, send -1 instead of NaN or Infinity
• Fix: NetStream was not assigned in FtpSocketStream for .NET Standard in active FTP mode (thanks @ralftar)
• Fix: CurrentDataType was not set for ASCII transfers in DownloadFileAsync/UploadFileAsync (thanks @taoyouh)
• Fix: Sometimes FtpSocketStream and FtpDataStream are not disposed in FtpSocketStream.Dispose (thanks @taoyouh)

19.1.0

• New Progress reporting for UploadFile & DownloadFile methods via IProgress
• Fix: Stream.Position should not be set in UploadFileInternal unless supported

19.0.0

• New Task-based async methods for .NET Standard and .NET Fx 4.5 (thanks @taoyouh)
• New async methods for UploadFile, DownloadFile, UploadFiles & DownloadFiles (thanks @artiomchi)
• (UWP) Fix: FileNotFoundException with reference System.Console (thanks @artiomchi)
• (.NET core) Fix: Thread suspends when calling UploadFile or DownloadFile (thanks @artiomchi)
• (.NET core) Fix: File download hangs inconsistently when reading data from stream (thanks @artiomchi, @bgroenks96)
• (.NET core) Fix: Stream does not dispose due to wrong handling of closing/disposing (thanks @artiomchi)
• Fix: File upload EOS bug when calling Stream.Read (thanks @bgroenks96, @artiomchi, @taoyouh)
• Fix: DownloadFileInternal not recognizing the download data type with EnableThreadSafeConnections (thanks @bgroenks96)
• (Backend) Migrate to a single VS 2017 solution for all frameworks (thanks @artiomchi)
• (Backend) Continuous Integration using AppVeyor (thanks @artiomchi)

18.0.1

• Add IFtpClient interface to build unit tests upon main FtpClient class (thanks Kris0)
• Disposing FtpDataStream reads server reply and closes the underlying stream (thanks Lukazoid)

18.0.0

• New SetModifiedTime API to change modified date of a server file in local timezone/UTC
• Add type argument to GetModifiedTime, allowing for getting dates in UTC/Local timezone
• Breaking changes to Async API of GetModifiedTime (addition of type argument)
• GetModifiedTime and SetModifiedTime now honor the TimeOffset property in FtpClient
• Add checkIfFileExists to OpenRead, OpenAppend and OpenWrite to skip GetFileSize check
• Fix issue where InnerException is null during a file transfer (upload/download)
• Improve performance of typical uploads/downloads by skipping the extra file exists check

17.6.1

• Fix for CreateDirectory and DirectoryExists to allow null/blank input path values
• Fix for GetFtpDirectoryName to return correct parent folder of simple folder paths (thanks ww898)

17.6.0

• Add argument validation for missing/blank arguments in : Upload, Download, UploadFile(s), DownloadFile(s), GetObjectInfo, DeleteFile, DeleteDirectory, FileExists, DirectoryExists, CreateDirectory, Rename, MoveFile, MoveDirectory, SetFilePermissions, Chmod, GetFilePermissions, GetChmod, GetFileSize, GetModifiedTime, VerifyTransfer, OpenRead, OpenWrite, OpenAppend
• Disable all async methods on .NET core due to persistant PlatformUnsupported exception (if you need async you are free to contribute a non-blocking version of the methods)

17.5.9

• Increase performance of GetListing by reading multiple lines at once (BulkListing property, thanks sierrodc)

17.5.8

• Add support for parsing AS400 listings inside a file (5 fields) (thanks rharrisxtheta)
• Retry interpreting file listings after encountered invalid date format (thanks rharrisxtheta)
• Always switch into binary mode when running SIZE command (thanks rharrisxtheta)

17.5.7

• Honor UploadDataType and DownloadDataType in all sync/async cases (thanks rharrisxtheta)
• Force file transfers in BINARY mode for known 0 byte files (thanks rharrisxtheta)
• Allow file transfers in ASCII mode if the server doesn't support the SIZE command (thanks rharrisxtheta)

17.5.6

• Fix NullReferenceException when arguments are null during FtpTrace.WriteFunc

17.5.5

• Remove internal locking for .NET Standard 1.4 version since unsupported on UWP

17.5.4

• Remove dependency on System.Threading.Thread for .NET Standard 1.4 version (for UWP)

17.5.3

• Allow transferring files in ASCII/Binary mode with the high-level API (UploadDataType, DownloadDataType)

17.5.2

• Add support for .NET 3.5 and .NET Standard 1.4 (supports Universal Windows Platform 10.0)

17.5.1

• Add FtpTrace.LogToConsole and LogToFile to control logging in .NET core version

17.5.0

• Add PlainTextEncryption API to support FTPS servers and plain-text FTP firewalls (CCC command)
• FluentFTP now uses unsafe code to support the CCC command (inside FtpSslStream)
• If you need a "non unsafe" version of the library please add an issue

17.4.4

• Add logging for high-level function calls to improve remote debugging (FtpTrace.LogFunctions)
• Add settings to hide sensitive data from logs (FtpTrace.LogIP, LogUserName, LogPassword)
• Add RecursiveList to control if recursive listing should be used
• Auto-detect Windows CE and disable recursive listing during DeleteDirectory()