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Mobile app · Security & privacy

FwKnop-ng

Port knocking client for FwKnop (Single Packet Authorization).

  • Completely free
  • Android
  • Open source

Overview

FwKnop-ng is a firewall, available on Android.

Services and protocols mentioned: SSH.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “FwKnop-ng sends an encrypted, authenticated SPA packet that makes a server open a firewall port for your IP address — keeping services such as SSH or VPN invisible to everyone else.” — GitHub, 10 November 2026

At a glance

FwKnop-ng is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (AGPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No advertising
  • Commercial use allowed

Sources and checks

  • Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) —
  • Last technical check: 6 November 2026
  • Description from F-Droid — F-Droid (citation courte)

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