Windows error 64 (ERROR_NETNAME_DELETED): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: An established network share context was invalidated or no longer exists.

Could be also:
Constant	Type	OS
ENONET	errno	Linux
EHOSTDOWN	errno	Mac
ENONET	errno	Solaris
TARGET_MDL_TOO_SMALL	BugCheck Code	Windows

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ERROR_PRINT_CANCELLED	ERROR_NETWORK_ACCESS_DENIED

ERROR_NETNAME_DELETED

For SMB2/SMB3, access to a share is represented by a tree connect identified by TreeId. The MS-SMB2 server rules require a request to fail with STATUS_NETWORK_NAME_DELETED when the referenced tree connect cannot be found. Windows can map that protocol condition into the Win32 network-name-deleted error.

This is why the code can appear after a connection previously worked. A transport disconnect can invalidate tree-connect and session state; a subsequent request using stale connection state is different from a first attempt to locate a misspelled share, which is closer to ERROR_BAD_NET_NAME.

What to inspect

Correlate the error with an SMB disconnect, reconnect, failover, or server/service restart.
Determine whether the operation used a stale file or share handle after connection loss.
Capture SessionId and TreeId around the failure when protocol tracing is available.
Do not fix this by changing share ACLs unless the reconnect itself is denied.

MS-SMB2 tree-connect verification · MS-SMB2 network disconnect handling · Samba smbclient manual

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