negative_dns_ttl

negative_dns_ttl

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This is similar to positive_dns_ttl , except that it applies only to failed DNS queries. That is, when Squid receives an error for a DNS lookup, it negatively caches the error for this amount of time. It doesn't retry the query until the negative TTL expires . This applies to both internal and external DNS implementation choices.

Syntax	negative_dns_ttl time-specification
Default	negative_dns_ttl 5 minutes
Example	negative_dns_ttl 1 minute
Related	positive_dns_ttl