XigmaNAS

Q: Why can I not login using Windows 7, 8 and Vista clients when XP clients work fine with CIFS/SMB?
A: People have reported different causes / solutions for this error. The most likely solutions are #1 & #2 but feel free to try the others.

1. If you are using Windows 7 or Vista clients you might want to check your LAN Manager Authentication settings [SOLVED] smb_pwd_check_ntlmv1: incorrect password length. See also SMB Errors When Copying Files [SOLVED] Windows 7. See Authentication Issues; Microsoft Article ID: 954387 for more details.
2. If you are using Domain Authentication, the CIFS/SMB (Samba) auxiliary parameter use spnego = false has been reported to prevent this error. This may also work with other authentication methods. See Windows 7 and FreeNAS
3. If you enabled LDAP or Active Directory services, turn them off and see if the errors go away.
4. Some people have reported these errors occur when folders shared via UPnP have the wrong permissions. Turn off UPnP service and see if the errors go away.
5. Check the CIFS/SMB setting of “Null Passwords” if it has a check mark remove it and see if that makes the errors go away.

Also remember there are more settings that can be incorrect on the client than the server and they are usually simple to correct, but hard to find. Example: Win7 cannot see NT1 CIFS share.