I've got a nas box running some flavour of linux 126.96.36.199.nv+v2 with an arm processor.
It has got a samba share called 'all' that has full read write access to everyone. However one Windows machine cannot access it without prompting for authentication and I found out from the logs that the windows account matches a local account on the nas box. What I then went to do is delete the local account on the nas. I can see that /home,/etc/password + /etc/shadow the account doesn't exist anymore. However the samba logs, shows that it thinks it is still there as it says account is disabled. I've tried rebooting both nas + windows box. Is there somewhere else that it stores account information? I logged on with a different account on that Windows machine and I can access the share fine. The smb logs shows that it can't find the user and then allows anonymous access.