Published by CipherDyne Security

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  3. Importantly, customers can learn from other customers in case the issue is a common problem that has been solved before.
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About Fwknop2

1. Fwknop2 allows you to send spa packets to an fwknopd service to remotely open ports on a Linux machine or a router running OpenWrt.

2. Fwknop2 has the ability to launch an ssh client to start the login process through the newly opened port.

3. It also includes the ability to import keys via QR codes.

Fwknop2 Customer Insights

1. Thank-you for a follow-up for the qr-capture on github.Works on Android with key authentication, sadly app hardlocks after selecting a gpg key and must be force closed.Before update I could paste allow ip.

2. And the developer is extremely quick to respond to the occasional issue that may appear (like the application locking up when you hit "Save Config" for a new config).Hello, The install works but an attempt to scan the QR code is unsuccessful.

3. Been using for a couple years, works great! Simple and does the job connecting to my fwknopd service.Really powerful and useful app.

4. Thanks againNumeric inputs for IP addresses, high five + five stars!But doesn't detect OpenVPN client on Android.

5. I use ConnectBot as SSH client and I run it as external app through Fwknop2 using SSH uri.Great app and thanks for including support for gpg.

6. Thanks again & HTHAn extremely powerful fwkop client made easy to use with saved configurations.

7. Unlike most of the "lightweight" fwknop clients, fwknop2 exposes a huge variety of options, allowing me to do anything I need even from my Android.

8. #2 When typing the PW for the gpg key takes too long the SPA packet is rejected by the server: (stanza #1) SPA data time difference is too great (50 seconds).

9. now only allow paste in this format xxxxx.xx.xx. Recently started using this to access my home openvpn.

10. But I ran into two larger obstacles: #1 gpg keys with 3072 bit (default for the OpenKeychain app) did not work - only 2048 bit work.

11. Why not make choose launching any app instead?Works like a charm.

Steps to Troubleshoot & Fix Fwknop2 Issues

1. Fix Fwknop2 Not Working/Crashes/Errors/Unresponsive & Black/White screen:


  1. Restart Fwknop2: Restarting the app will resolve most errors.
  2. Update the Fwknop2 App. Here is how:
    1. On Android goto PlayStore » Search for "Fwknop2" » Open Fwknop2 » click "Update".
    2. On iPhone, goto AppStore » Your profile » Available Updates » Check for Fwknop2 » click "UPDATE".
  3. Clear Fwknop2 app cache: Clearing cached data will force your app to retrieve the latest data directly from Fwknop2 servers.
    1. On Android, goto Settings » Apps » Select "Fwknop2" » click Storage » click "Clear Cache".
  4. Check Fwknop2 app permissions. If any of these permissions required to use your device's features are disenabled, Fwknop2 might not work.
  5. Uninstall and reinstall Fwknop2. If nothing else has worked, completely uninstall Fwknop2 then reinstall.
  6. Restart your device. Last, restarting your device can often clear most problems causing Fwknop2 not working


2. Fix Fwknop2 Server issues & Internet Connection


  1. Check network connection: An unstable Internet will make Fwknop2 be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
  2. Disable VPN: VPN can cause connection errors and lead to Fwknop2 not working. Make sure all VPNs are off
  3. Enable background data: When Background data is turned off, Fwknop2 may not be able to connect to the Internet when running in the background.

Reported Issues