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DNS Scavenging issue

Yogesh Bhatia 21 Reputation points
2021-09-22T08:04:57.74+00:00

Hello,

We are facing some issue related to DNS scavenging, When scavenging process runs, it deletes the specific 2 servers HOST A resource record from the zone, This things is happening with only 2 servers, apart from this, other servers Host A record is fine. also, it deletes the entry after 4-5 days.

Can anybody help me to suggest the possible cause of this?

DNS scavenging settings:

Non-refresh interval : 1 day

Refresh interval : 1 day

Windows for business | Windows Client for IT Pros | Directory services | Active Directory
Windows for business | Windows Client for IT Pros | Networking | Network connectivity and file sharing
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  1. Charles Thivierge 4,181 Reputation points
    2021-09-22T11:39:08.56+00:00

    Does your DNS Zone is AD integrated ?

    Are you able to see the timestamp of the record in the DNS ?

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  2. Charles Thivierge 4,181 Reputation points
    2021-09-22T10:20:55.983+00:00

    In the DNS, if you open the A record and click on the security tab, do you see the computer account in the list and normally, it should have full control

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  3. Charles Thivierge 4,181 Reputation points
    2021-09-22T10:13:04.113+00:00

    Are they using static IP or DHCP?

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  4. Charles Thivierge 4,181 Reputation points
    2021-09-22T09:40:41.673+00:00

    Does the DNS Service or the DC has a planned reboot ?

    I think that could be possible...

    The non-refresh interval is a period where the resource record cannot be refreshed. This is only to reduce replication traffic between DC's
    The refresh interval is the period where the resource record can be updated by the computer.

    Let say the scavenging process of the DNS Server is running at 12:00PM each 2 days starting on Sunday (keep in mind that the scavenging is reset when the DNS service restart)

    • Sunday at 12:01PM, ServerA just started and creates his DNS resource record (A record).
    • Sunday at 6:00PM, ServerA is disconnected from network
    • The no-refresh interval ends on Monday 12:00PM
    • Monday at 12:00PM, the resource record (A) has not finished his non-refresh interval because it has not reach his 1 day
    • Tuesday 12:00PM, the resource record (A) has completed the non-refresh interval
    • Wednesday 12:00PM, the resource record (A) has not finished the refresh interval
    • Thursday 12:00PM, the resource record is flagged to be scavenged
    • Saturday 12:00PM, the resource record will be deleted by the scavenging process

    So yes... it's possible depending when the record has been created

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  5. Charles Thivierge 4,181 Reputation points
    2021-09-22T09:14:41.86+00:00

    What is the scavenging period on the DNS Server ?
    Properties of the DNS Server / Advanced tab

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