I am finishing up an install of Small Business server 2008 for a customer and I have stumbled into a quirky situation. If I am sitting at some client machines that have already been added to domain, I can not authenticate to the server via RDP. What is peculiar is that I can from a few of them but the rest I can not. What I get is an improper username/password error. Other workstations I can remote into the server just fine. I thought that perhaps the version of RDP on some workstations may be older so I went through windows updates to get the latest but I am still unable to RDP from those workstations. Anyone have some suggestions?