Unable to scan server / workstations in child domain

Unable to scan server / workstations in child domain

I am using SD+ 6.0.12 and I am having trouble scanning workstations and servers in a child domain. I have temporarily disabled the windows firewalls and I checked the boxes for remote dcom but the boxes still come up as unable or offline. I can ping from the server running SD+ to the workstations I am trying to scan by using the fully qualified domain name but SD+ doesn't seem to see them. This is a really urgent matter that I need to get resolved ASAP.

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