NethServer Version: 7.6
Module: server manager alpha
new server manager module reports an error on DNS availability. However both DNS IPs can be reached by ping. Is this a bug in the module or do I really have problem with my DNS?
Had the same. Didn’t verified if they were responding or not but I have no reason to think they were not.
This gave me the occasion to switch to https://dns.watch however 
The system checks if the server can actually resolve names: https://github.com/NethServer/nethserver-cockpit/blob/master/api/system-dns/hints#L33