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zonemaster.es/zonemaster/docs/public/specifications/tests/Zone-TP/zone04.md
Malin 8d4eaa1489 feat: add full Zonemaster stack with Docker and Spanish UI
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-21 08:19:24 +02:00

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## ZONE04: SOA 'retry' at least 1 hour
### Test case identifier
**ZONE04** SOA 'retry' at least 1 hour
### Objective
The SOA retry value is the number of seconds that describes
minimum time elapsed since a failed zone refresh from the primary
name server. The SOA refresh value is described
in section 3.3.13 in [RFC 1035](https://datatracker.ietf.org/doc/html/rfc1035),
and clarified in section 2.2 of
[RFC 1912](https://datatracker.ietf.org/doc/html/rfc1912).
Setting the retry value low will increase the DNS traffic between
the servers, and also increase the load on the master name server.
The [RIPE-203](https://www.ripe.net/publications/docs/ripe-203) recommendation
for the retry value is 2 hours (7200 seconds). Older DNSCheck code
had a one hour minimum value (3600 seconds), and this is the minimum
value we recommend.
### Inputs
The domain name to be tested.
### Ordered description of steps to be taken to execute the test case
1. Retrieve the SOA record from a delegated name server for the domain.
2. If the answer from step 1 is not authoritative, iterate step 1 until there is an authoritative answer.
3. Retrieve the retry value from the SOA record.
4. If the retry value is less than 3600 seconds, this test case fails.
### Outcome(s)
If the retry value is less than 3600 seconds, this test case fails.
### Special procedural requirements
None.
### Intercase dependencies
None.