FTPxy2

FTPxy2 is a cross-platform file transfer protocol and reference implementation designed to provide secure, efficient transfer of large data sets over wide-area networks. Building on the historical FTP model, FTPxy2 adds modern security, performance, and extensibility features while preserving compatibility with existing FTP tooling where possible.

Its architecture uses a two-channel model: a control channel for commands and a data channel for file payloads. The protocol negotiates capabilities at session start and can operate over encrypted transports such as TLS. It supports both passive and active connection modes, makes use of parallel data streams, and includes integrity verification via per-file hashes.

Key features include strong authentication options (password, client certificates, and token-based methods), optional mutual TLS, resumable transfers, streaming compression, and pluggable authentication modules. FTPxy2 provides a mapping layer to translate conventional FTP commands to its own extended command set to ease migration, and it offers a compatibility mode for legacy clients.

An open-source reference implementation exists under a permissive license, with a documented protocol specification and developer tools. The project emphasizes security best practices, regular updates, and patch management, and it supports deployment in on-premises data centers, cloud environments, and hybrid networks. Interoperability with standard FTP servers may require configuration to enable compatibility features.

FTPxy2 remains in active use in environments handling large files and sensitive data, and efforts continue to extend performance, error handling, and enterprise features. Documentation and downloads are available from the official project website.