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...r Kerberos auth, and the user is labelled as a guest user. Guest users are mapped to bad user in samba config. Here's a bit of logging when the Windows client tries to access a share: https://pastebin.com/pbEqj9ZR Configs; smb.conf: https://pastebin.com/XfeVTCDE sssd.conf: https://pastebin.com/Z57rRwBw krb5.conf: https://pastebin.com/JigdxgJ6 Some other interesting tidbits: DNS is served by el6/bind, not by AD, but the AD srv records exist and work properly for auto discovery and binding. The samba server does not have a PTR record, although this seems to be a requirement for KDC's not membe...