FTP Connection Not Working After KPN Modem Firmware Update
⚠️ Note: After a recent firmware update on KPN modems, such as the KPN Box 12, port 21 (FTP) may be automatically blocked.
Cause
The firmware update tightened the modem’s firewall settings. As a result, port 21 is blocked by default, preventing traditional FTP connections from working.
Solution
You can easily resolve this issue by adjusting the modem's firewall security level:
- Log in to your KPN modem via http://192.168.2.254.
- Go to Settings > Security > Firewall.
- Set the firewall to Low.
- Save the changes.
- This adjustment is also recommended by KPN itself.
- If you are unsure, it is best to contact KPN customer service for assistance.
More Information and Support
- FTP no longer working after Box12 update – KPN Community
- FTP not working – KPN Community
- Firewall settings on KPN modems – Knowledge Base
If you still have questions or cannot adjust the settings, please contact KPN Support for further assistance.
Updated on: 23/05/2025
Thank you!