Hello,
we have computers without a domain runnning WindowsXP. I notice that all the WindowsXP are still red in Lansweeper. The connectiontester show me that remote registry access is not possible. The service still runs, account is set up properly, firewall disabled, dns checked. But it dont work.
I dig a litte bit deeper and found that the easy folder sharing is enabled on the WindowsXP computers. This prevent remote computer to authentificate properly. The solution was simple: disable the easy access. To do this go to system control, folder settings, 2nd tab and remove the checkmark. Now all my computers becomes blue. Problem solved.