Start Group policy for updating registry on client computers

Group policy for updating registry on client computers

The cause of this could be (a) your computer does not have permissions to register and update the specific DNS domain name set for this adapter, or (b) there might have been a problem negotiating valid credentials with the DNS server during the processing of the update request.

Now, as per the guidance text of the policy you need to do the following and you will have disabled SMB1 on all your Windows computers.

I am administering a system which for reasons beyond my control have a disjoint DNS namespace.

In that case I don't see why you have the GPO in the first place since it will always be overruled by the local setting.