I tried changing an SMB Share ACL from “Everyone” to a single user but wasn’t sure what to enter in the SID or domain field.

The help text said:

Local users have the SMB server NetBIOS name: freenas\\smbusers

And the documentation said it was truenas\\smbusers.

But neither worked an caused the following error:

CallError [EFAULT] SID lookup for freenas\\smbusers\user failed: failed to call wbcLookupName: WBC_ERR_DOMAIN_NOT_FOUND Could not lookup name freenas\\smbusers\user


To lookup the local domain I ran net getlocalsid as root and got:

SID for domain TRUENAS is: […]

So this means I need to enter TRUENAS as the domain. When also setting the username and saving it automatically fills out the SID.

Additionally the user SIDs can be listed with: net usersidlist