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ERROR_INVALID_EVENTNAME
The specified event name is malformed for the API that received it.
ERROR_INVALID_EVENTNAME is Win32 error 1211 (0x4BB). The name “event” is contextual: this result is not automatically about a kernel event object created by CreateEvent, and it does not mean that an Event Log record contains invalid text. The returning API defines the namespace and syntax.
Start with the exact call site
Capture the function, provider, structure member, and operation being performed. Older networking and administrative interfaces use event or notification names differently from synchronization APIs. Without the call site, replacing punctuation or changing Event Viewer settings is guesswork.
Input defects worth checking
- an empty string after environment-variable or template expansion
- leading or trailing whitespace copied from a configuration file
- a qualified path supplied where a simple name is required
- embedded NUL or control characters introduced by encoding conversion
- a display label substituted for a provider-defined identifier
- length measured in bytes although the API receives Unicode characters
Logging without losing the defect
Record an escaped form of the input, its character count, and a hash if the value may contain sensitive deployment information. A normal log formatter can hide tabs, carriage returns, or trailing spaces and make the bad value look correct. Keep the original return code instead of translating every name error to ERROR_INVALID_PARAMETER.
Developer handling
Validate only after selecting the correct namespace. If the product supports several providers, each adapter should check its own naming contract. Reject malformed values before making remote calls, but still handle 1211 because server-side policy and platform versions may impose additional rules.
Administrator action
Correct the source configuration or provisioning data and retry the original operation. Do not create a kernel event or clear Windows event logs merely because the symbolic constant contains EVENTNAME. If the name comes from a legacy component, confirm that the component is still supported on the target Windows version.
Related results
ERROR_INVALID_MESSAGENAME applies to a message name, and ERROR_INVALID_MESSAGEDEST applies to its destination. ERROR_INVALID_NAME is a broader naming error used by other APIs. Error 1211 specifically identifies the event-name field of the current interface.
Example
A management bridge reads an event identifier from an INI file and preserves a trailing tab. The remote operation returns 1211. Escaped telemetry reveals MaintenanceComplete\t; the bridge fixes its parser, validates the provider-specific identifier, and retries with the intended name.
References
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