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Event ID 4778: A session was reconnected to a Window Station

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

A session was reconnected to a Window Station.

Event 4778
Security-Auditing
Security log
Audit Success

A user reconnected to an existing session (Remote Desktop reconnect or fast user switching).

What to check: Client Name and Client Address show where they reconnected from.

Related: 4779, 25

Message and fields (as Event Viewer shows them) 
A session was reconnected to a Window Station.

Subject:
	Account Name:		…
	Account Domain:		…
	Logon ID:		…

Session:
	Session Name:		…

Additional Information:
	Client Name:		…
	Client Address:		…

This event is generated when a user reconnects to an existing Terminal Services session, or when a user switches to an existing desktop using Fast User Switching.