Looks like the domain was suspended # whois mynetname.net | grep -i sus

Name Server: ns1.suspended-domain.com Name Server: ns2.suspended-domain.com

# whois mynetname.net | grep -i date

Updated Date: 2021-09-06T10:48:09Z Creation Date: 2014-04-29T08:21:38Z Registry Expiry Date: 2022-04-29T08:21:38Z Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited

The domain was updated around 12 hours ago, which is when it seems to have stopped working.