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ERROR_SESSION_CREDENTIAL_CONFLICT
Windows network connections are not isolated solely by drive letter. WNet can create deviceless connections as well as mapped devices, and an existing connection to the same server can establish the credential context later operations reuse. Error 1219 is the explicit conflict when another user name is requested for the server/shared-resource connection.
Inventory all connections to the server, not just the drive letter named by the failing application. An Explorer access, a deviceless WNet connection, a startup script, or another mapped share can hold the earlier session. Samba client tooling exposes the same practical separation between choosing credentials and connecting to a service.
Find the earlier credential context
- Enumerate active and remembered connections to the server under the same Windows logon session.
- Normalize server names when comparing connections; aliases and IP literals can complicate diagnosis.
- Record the identity used by the existing session and the identity requested by the new connection.
- Disconnect the earlier connection only when changing the server credential context is intentional.
WNetAddConnection2 · Samba smbclient manual · Windows network redirector architecture
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