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ERROR_NO_SITENAME
No Active Directory site is available for this machine.
ERROR_NO_SITENAME is Win32 error 1919 (0x77F). DsGetSiteName asks Netlogon for the Active Directory site associated with a computer. Site selection normally derives from the client IP address and subnet objects, or from configured domain-controller site placement. The status means discovery completed without an applicable site name.
Why a computer has no site mapping
- its current IPv4 or IPv6 network is not represented by an Active Directory subnet object
- the subnet exists but is linked to the wrong site or replication has not delivered the change
- VPN, NAT, virtual adapters, or multihoming causes discovery to use an unexpected address
- the computer cannot contact a controller to refresh dynamic site information
- Netlogon is stopped, unhealthy, or operating with stale cached topology data
Site-discovery evidence
Capture the computer name, domain, active interface addresses and prefixes, DNS servers, VPN state, subnet objects considered, domain controller contacted, cached and dynamic site values, DsGetSiteName return code, and Netlogon events. Avoid logging unrelated public or privacy-sensitive addresses; retain only interfaces relevant to domain routing.
Diagnostic sequence
Determine which client address is used for domain communication and match it against the most specific Active Directory subnet. Verify that the subnet is linked to the intended site and replicated to the controller answering the client. Call DsGetSiteName locally and compare before and after a Netlogon rediscovery.
Check DNS and controller discovery if no suitable DC is reachable. For VPN clients, decide whether their address pool should map to an existing site or a dedicated site. On multihomed servers, inspect route selection rather than assuming the interface with the default route defines the AD site.
Administrative correction
Create or correct the subnet-to-site mapping, restore replication and Netlogon health, then force or wait for rediscovery. Do not assign an arbitrary site merely to suppress the error; site choice influences authentication, DFS, replication, and service locality.
Network changes should include an Active Directory subnet review. Applications should tolerate absence of a site only if their contract permits non-domain or disconnected operation and should not invent a site name locally.
Difference from domain-controller discovery failure
ERROR_DOMAIN_CONTROLLER_NOT_FOUND means no suitable controller was located. Error 1919 can be returned when domain services are reachable but the computer’s network location does not map to an Active Directory site.
Example
A new VPN pool uses 10.44.0.0/20, but no matching AD subnet exists. Remote clients authenticate yet DsGetSiteName returns 1919 and locality-sensitive services choose poor endpoints. Adding the subnet to the designated remote-access site resolves the topology gap.
References
- Microsoft: System Error Codes (1700–3999)
- Microsoft: Win32 Error Codes in MS-ERREF
- Microsoft: DsGetSiteName
- Microsoft: Active Directory site design
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