What are the common causes of DNS scavenging issues?

There are several common causes of DNS scavenging issues, including below:

1. Incorrect scavenging settings: Incorrect scavenging settings can prevent DNS scavenging from running correctly. For example, if the scavenging period is set too high, stale DNS records may not be removed from the cache in a timely manner.
2. Permissions issues: Permissions issues can prevent the DNS server from performing DNS scavenging. For example, if the DNS server computer account does not have the necessary permissions to access the DNS zone, DNS scavenging may not work correctly.
3. DNS server configuration issues: DNS server configuration issues can prevent DNS scavenging from running correctly. For example, if the DNS server is not configured to use dynamic updates, DNS scavenging may not work correctly.
4. Network issues: Network issues can prevent the DNS server from communicating with other servers and clients, which can prevent DNS scavenging from working correctly.
5. DNS record ownership issues: DNS record ownership issues can prevent DNS scavenging from removing stale DNS records. For example, if a DNS record is owned by a client computer that is no longer on the network, DNS scavenging may not be able to remove the record.
6. Firewall issues: Firewall issues can prevent the DNS server from communicating with other servers and clients, which can prevent DNS scavenging from working correctly.

To troubleshoot DNS scavenging issues, it’s important to review the DNS server logs for errors and events related to DNS scavenging, and to check the DNS server configuration and permissions settings. Additionally, it may be helpful to perform network and firewall troubleshooting to ensure that the DNS server is able to communicate with other servers and clients on the network.

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