Section 3.117.13. NAPTR-Pattern
Section 3.117.14. NegativeCacheTtl
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Section 3.117.15. FailureBackoffTime
3.117.14. NegativeCacheTtl
This optional value specifies how long a negative lookup (ie failure to resolve the realm) will be cached until another lookup will be made. Defaults to 21600 seconds (6 hours).