To find and fix a DNS server error, follow these steps:

1. Check the DNS settings in your computer, router, or modem.
2. See if the DNS server is connected to a Multi-Protocol Label Switching (MPLS) network.
3. Verify that the DNS server is an authoritative server.
4. Check the network settings for any faulty cables or incorrect data.
5. Clear any cached DNS information on your device.
6. Check the connection of the domain name server (DNS) to see if it is operating properly.
7. Restore the DNS from its backup.