PortImport

Easily create a fault-tolerant network tunnel to back-end machines having no direct inbound access. Connect to multiple TCP and UDP ports on secured remote systems by having just one of them make a single TCP connection outbound. Intermix IPv4 and IPv6 addresses and interfaces as needed, enabling the access of IPv6 back-end addresses over an IPv4 Internet connection or vice versa. Installation is optional, and both components use relative file paths for true portability. Front-end shows real-time data statistics while back-end shows a real-time event log. Both ends can be text-file scripted for turn-key tunnelling without user-interaction. Static-built native code requires no special frameworks or libraries. Both 32 and 64-bit builds are provided for maximum performance. Both components support running as system services, have full Unicode support, and were developed on Windows 8.1 to support the latest technology.