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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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