DrayTek Vigor 3900/2960: Let’s Encrypt ‘Domain Verify Timeout’

If you’re unable to generate a Let’s Encrypt certificate for your DrayTek OS router and the error given is ‘Domain Verify Timeout’, check the following:

Under System Maintenance > Access Control:

  • Check Enforce HTTPS Management is Disabled for Internet Access Control
  • Check Web Allow is Enabled for Internet Access Control
  • Check Web Port is configured to use port 80

Under Firewall Filter Setup 

  • Check your Firewall rules allow port 80 inbound

Reboot the router, refresh the DDNS IP, and try again.

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