DNS
1 FORMERR
Format error. The name server was unable to interpret the query due to a malformed DNS message.
When You See This Code
Your DNS client or library sent a query the server could not parse, often caused by a buggy resolver, corrupted packet, or unsupported EDNS options.
How to Fix
Check your DNS client or library version for known bugs. Capture the raw query with dig or Wireshark and verify it conforms to the DNS wire format.