Stale DNS cache after change
Resolvers still serve prior answers after an authoritative change because TTL has not expired.
- Reading time:
- 5 min
- Difficulty:
- Intermediate
- Estimated duration:
- 5 min
- Prerequisites:
- None
- Last updated:
- 2026-07-15
- Author:
- empire
Related Concepts
Related Problems
- CNAME at zone apexA CNAME is placed at the zone apex where other record types are also required.
- Inconsistent authoritative answersAuthoritative name servers for the same zone return conflicting data.
- Incorrect MX targetMX points to the wrong host name or unreachable mail server.
- Missing glue recordsDelegation references in-bailiwick name servers without required glue.
- MX record missingNo MX record is published for a domain that should receive mail.
- NXDOMAIN for expected nameA name that should exist returns NXDOMAIN from authoritative servers.
- Wrong TTL for cutoverTTL values are too high for a planned cutover, prolonging mixed old/new answers.