Problem with deployment on workgroup

Problem with deployment on workgroup

I am having some difficultly deploying onto our computers that are not part of our active directly. The Deployment Manager has found the computers and, if I plug in the wrong username/password info I get an immediate failure because of the bad logon info, with the correct logon info I get a "Failed" status with the remark "The computer is not reachable". We use PDQ Deploy/Inventory with these machines without much trouble.