Problems resolving DNSv2 domains

The problem has been resolved.

Thank you for your understanding.

Currently, the DNS server b.ns.selectel.ru works correctly on port 53/TCP.

We recommend using port 53/UDP for other DNS servers, everything works stably on this port.

At the moment, there are problems with resolving domains via 53/TCP for DNSv2.

Profile specialists are already investigating the causes of the problem.