Windows error 58 (ERROR_BAD_NET_RESP): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The remote server responded, but the requested network operation could not be performed as expected.

Could be also:
Constant	Type	OS
EDEADLOCK	errno	Linux
ESHUTDOWN	errno	Mac
EOWNERDEAD	errno	Solaris
SYSTEM_UNWIND_PREVIOUS_USER	BugCheck Code	Windows

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ERROR_ADAP_HDW_ERR	ERROR_UNEXP_NET_ERR

ERROR_BAD_NET_RESP

This status implies more than simple absence of the server. A network redirector sends a remote operation and translates the server response back to the caller. In SMB, authentication establishes a session and TREE_CONNECT selects a share before file operations are issued; a server can therefore be reachable yet reject or fail a specific stage.

Capture the last successful protocol boundary. If negotiate and session setup succeed but TREE_CONNECT fails, inspect the share name and share policy. If the tree is established and a later create/write fails, investigate the object operation and server-side status instead of treating the server as unreachable.

Protocol-stage diagnosis

Record whether transport connection, SMB negotiate, session setup, and tree connect completed.
Keep the server status or provider extended error that preceded Win32 translation.
Compare the same operation against another share on the server.
Check server logs for the exact request rather than restarting the client first.

Windows network redirector architecture · MS-SMB2 TREE_CONNECT · Samba smbclient manual

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