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[Samba] explorer.exe: no mapping between names and security ids was done

... I just want to put this somewhere easily searchable based on the users error message.

Upgrading a domain controller to Debian 8 (samba 3 to 4) resulted in the message "no mapping between names and security ids was done" at times. The message appears on the windows 7 domain pcs when running explorer.exe. Also other basic things did not work: internet explorer, or mapping between file types and extensions. But only at times.

The problem is apparent when running set in a command on the affected windows pc. Look for the USERDOMAIN variable somewhere at the bottom of the list. It is not set to the real domain name. In my case it was the name of the server before it became a domain controller. I suspect the system was hanging together due to netbios names - eek. Mostly and for years running Debian 7, and samba 3 this was accidentally reliable.

A quick fix is possible on the samba domain controller:

sudo pdbedt -I "MYDOMAIN" -u username

.. the next login should return things to normal for the user.

From the pdbedit manpage:

           This option can be used while adding or modifying a user account. It will specify the user's domain field.

           Example: -I "MYDOMAIN"

Hope this helps someone


Ref: This hint - https://lists.samba.org/archive/samba/2005-December/115411.html from way back

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