As of yesterday, July 6, 2022, we have a service outage. The master DNS server lost connectivity to the Internet, it took a long time to get it back, and meanwhile, the secondary DNS servers’ copies of the zones expired. The master DNS server is back online but the Internet service provider was kind enough to implement a firewalling that wasn’t asked for that prevents the secondaries from connecting to it on port 53, so the zone can’t be refreshed and has been discarded. We will report when the service is back online.