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Event ID 30826: The SMB negotiate response processing failed on the client to determine the selected encryption cipher for the client and server

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 SMB negotiate response processing failed on the client to determine the selected encryption cipher for the client and server.

Event 30826
SMBClient
SMBClient/Connectivity log
Error
Message and fields (as Event Viewer shows them) 
The SMB negotiate response processing failed on the client to determine the selected encryption cipher for the client and server. Please ensure there is a common cipher between the client and server.

Client encryption cipher suite order (most to least preferred): …
Server replied back with its selected encryption cipher ID: …