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Event ID 30911: The Cipher Suite Order group policy setting is invalid

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

The Cipher Suite Order group policy setting is invalid.

Event 30911
SMBClient
SMBClient/Connectivity log
Error
Message and fields (as Event Viewer shows them) 
The Cipher Suite Order group policy setting is invalid.

Guidance:

This event indicates that an administrator has configured an invalid value for the "Computer Configuration\Administrative Templates\Network\Lanman Workstation\Cipher Suite Order" group policy setting. The client will use the default cipher suite order "…" until this error is resolved.