Greetings --
By changing the computer from the domain to a workgroup, you have
removed the "trust relationship" between the domain and the machine.
In doing so, you have also rendered any cached domain login
credentials as invalid. You need to be physically connected to the
domain network, you need to have administrative privileges to the
workstation, and you need to have administrative privileges on the
domain. Then you can add the machine back on to the domain, after
having first deleted the computer's old domain account (unless you've
also renamed the computer).
Bruce Chambers
--
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You can have peace. Or you can have freedom. Don't ever count on
having both at once. - RAH