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STATUS_NETWORK_CREDENTIAL_CONFLICT
STATUS_NETWORK_CREDENTIAL_CONFLICT is an identity-context collision, not proof that a password is wrong. Windows can reject an attempt to use another user name for a server when existing mappings or sessions already use a different credential context for that server.
How to narrow it down
Microsoft documents this behavior as by design for connections to two shares on one server using different credentials. The investigation should list all existing mappings and SMB connections, including hidden use by services, scheduled tasks, administrative shares and persistent connections.
Resolve the intended identity model instead of repeatedly trying credentials. Disconnecting obsolete connections, using a distinct server identity where that is an approved design, or isolating the work into a separate logon/session context are different operational choices with different security consequences.
Evidence that matters
- Inventory current connections to the server before adding a new mapping.
- Identify which process or service established the earlier credential context.
- Choose a single intended identity strategy rather than alternating credentials on retries.
References
- Microsoft Open Specifications: NTSTATUS reference
- Microsoft: different credentials for one network server
- Microsoft: Get-SmbConnection
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