Windows error 9722 (DNS_ERROR_ALIAS_LOOP): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A loop was detected in an alias chain involving CNAME or DNAME records.

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DNS_ERROR_DNAME_COLLISION	DNS_INFO_AXFR_COMPLETE

DNS_ERROR_ALIAS_LOOP

DNS_ERROR_ALIAS_LOOP means DNS alias processing found a loop involving CNAME or DNAME records. Because DNAME redirects an entire subtree, the loop can affect more names than a simple single-host CNAME loop.

What to check

Trace CNAME and DNAME targets from the queried name through each affected zone boundary.
Check recent namespace migrations, split-DNS changes, and automation that may have created reciprocal aliases.
Remove or correct the link that closes the loop, then re-query from an authoritative server and a resolver.

Resolve-DnsName -Name "name.contoso.com" -Server "dns-server" -DnsOnly

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