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.

Jon Procter

Linux, Unix, and Windows server sysadmin with strong experience in security and compliance.
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