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ERROR_INVALID_NETNAME
Windows rejected the specified network name before using it.
ERROR_INVALID_NETNAME is Win32 error 1214 (0x4BE). It indicates that the network resource name supplied to a redirector, provider, or management API is malformed for that interface. It is not the same as a valid share being offline or a remote server refusing a connection.
Identify the expected naming form
Depending on the API, the field can expect a UNC path such as \\server\share, a server name without slashes, a provider-specific remote name, or a local device mapping. Preserve the exact parameter boundaries. Joining strings without checking separators frequently turns a valid server and share into an invalid combined name.
Common construction errors
- missing one of the leading UNC backslashes
- using forward slashes in a Windows network-resource field
- supplying only
\\serverwhere a share is mandatory - embedding credentials, a URI scheme, or a port in a UNC name
- leaving an empty server or share component after substitution
- passing a local filesystem path to a network-provider API
Diagnostics
Log the escaped remote name, provider name, local device name, and API. Resolve and test the server component only after syntax has been validated. A successful DNS lookup does not make https://server/share a valid UNC path, and an SMB firewall test does not explain a malformed local-device mapping.
Programmer recommendations
- use a dedicated UNC builder rather than raw string concatenation
- retain server and share as separate structured fields
- reject URI input when the API requires a network resource name
- keep malformed-name errors distinct from
ERROR_BAD_NETPATH - test empty, Unicode, trailing-separator, and already-qualified inputs
User or administrator action
Correct the path or deployment policy that supplied the name. Verify the intended share in File Explorer or with an SMB-aware tool only after the format is correct. Recreating network adapters, changing DNS servers, or resetting credentials is premature when 1214 is returned during parsing.
Difference from related values
ERROR_INVALID_SHARENAME focuses on the share-name component. ERROR_BAD_NET_NAME commonly means a syntactically valid network name cannot be found. ERROR_INVALID_COMPUTERNAME concerns the computer-name field. Error 1214 identifies the full network-name format expected by the current operation.
Example
A service builds a remote path from configuration and produces \server\share with only one leading backslash after JSON unescaping. The mapping call returns 1214. Structured logging exposes the actual string, and a UNC builder produces \\server\share correctly.
References
- Microsoft: System Error Codes (1000–1299)
- Microsoft: Naming a Network Resource
- Microsoft: WNetAddConnection2W function
- Microsoft: Naming Files, Paths, and Namespaces
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