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This error message typically indicates an issue with the communication between the MSCHAP module and the Winbind daemon, which is responsible for mapping Windows domain user accounts to Unix user accounts. Possible causes of this error include incorrect configuration settings for Winbind, network connectivity issues, or problems with the Winbind service itself. Troubleshooting steps can include checking the Winbind configuration files, verifying network connectivity, and restarting the Winbind service.