Virtualbox - Can't ping between RHEL and Window Guests

I am using Virtualbox 5.1.2 and have set up 3 guests VMs: 2 Windows 2012 and 1 RHEL 7.2. All three have the same network adapters: NAT for Network Adapter 1 and Inteal Network (named intnet) for Network Adapter 2. I have disabled firewall on all three guests, firewalld on RHEL 7.2 and Windows Firewall on the Window boxes.

I can ping and telnet between the Windows VMs but I cannot ping or telnet to and from the RHEL VM. I'm not really an expert in networks, so I feel there may be additional steps in the Linux side. Any additional help would be greatly appreciate as I'm trying to replicate a work environment.

If you need additional information from my side, I'd be more than happy to share!

Thanks!

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