I'm using ads security. Everything is working fine, but the logs show that the samba servers regularly try to authenticate user 'nobody' against the DC. I know that these are part of standard operation, but it seems suboptimal to be constantly doing these checks on a large network... generating traffic and using DC and samba server resources to verify a domain account that never has and never will exist. domain_client_validate: unable to validate password for user nobody in domain DOMAIN to Domain controller DOMAIN.CONTROLLER.COM. Error was NT_STATUS_NO_SUCH_USER. Is there a way to tell samba to filter these from AD checking? It would seem quicker and simpler for samba to just recognize that any time someone uses 'nobody' in my setup to skip the verification and insert the NT_STATUS_NO_SUCH_USER itself.