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STATUS_INVALID_NETWORK_RESPONSE
STATUS_INVALID_NETWORK_RESPONSE means that bytes or a response reached the client, but they did not satisfy the expected network-protocol exchange. This is more specific than a timeout because a response existed; it is also different from a normal SMB error returned by the server for a valid request.
How to narrow it down
Preserve a packet trace and the client parser or provider log. The key evidence is the stage at which validation failed: negotiation, session setup, tree connect or a later request. A middlebox, an incompatible endpoint, a protocol downgrade attempt, data corruption or a client/server implementation defect can produce different traces but should not be collapsed into a generic connectivity issue.
Do not treat a share ACL change as a first response. Access policy is evaluated only after a valid protocol exchange has progressed far enough to identify the session and share.
Evidence that matters
- Record protocol dialect, request identifier and response framing around the failure.
- Verify that the endpoint is the intended SMB service rather than a proxy or unrelated listener.
- Compare the trace with one successful request to the same target and dialect.
References
- Microsoft Open Specifications: NTSTATUS reference
- MS-SMB2: SMB2 SESSION_SETUP processing
- Samba: smbclient manual
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