Cannot RDP to Certain PCs

I have two workstations running Windows 8 on my network that I am unable to RDP into. I can RDP into every other PC on my network without any issues and all of the settings are distributed via group policies, so they're identical on all of my workstations. I have tried connecting via the workstation's name and IP address. I also cannot ping the workstations.

I have made sure the computers are set to allow remote desktop connections, they are listed within Active Directory and my DNS server, Windows Firewall is disabled, and I am using Trend Micro Worry-Free Business Security, but it is active on all of my workstations and it shouldn't be restricting remote desktop connections.
steven_theckAsked:
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steven_theckConnect With a Mentor Author Commented:
I was able to get the issue resolved with some help from Trend Micro. They had me enable their built-in firewall and add port 3389 to the list of allowed ports, which enabled me to ping and RDP into the workstations. Thanks for your help henkva!
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Henk van AchterbergConnect With a Mentor Sr. Technical ConsultantCommented:
Can you disable Trend Micro and look if you can ping those workstations?

Also check if the firewall is still not active on different profiles (open the advanced firewall mmc).
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steven_theckAuthor Commented:
@henkva, disabling Trend Micro on the workstations did allow me to ping them, but I still cannot RDP to them. I checked the advanced firewall mmc, and the firewall is completely disabled for all profiles.
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Henk van AchterbergSr. Technical ConsultantCommented:
if you RDP from one Windows 8 to the other Windows 8 PC does that work (after disabling Trend Micro first)?
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steven_theckAuthor Commented:
@henkva I have tried doing that and it does not work. I opened a support ticket with Trend Micro and I'll update here once I receive a response.
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steven_theckAuthor Commented:
henkva's assistance led me to the solution I posted.
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