NC Security scan: Host not found?

Nextcloud version (eg, 12.0.2): 14.0.3
Operating system and version (eg, Ubuntu 17.04): Debian Stretch 4.9.88
Apache or nginx version (eg, Apache 2.4.25): nginx/1.10.3
PHP version (eg, 7.1): PHP 7.0.30

The issue you are facing:
When trying to execute a security scan via I only get “Host not found”.
My Cloud is completely normal accessible, so whats the issue?

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Go to
  2. Search for