This is my issue: I have a 2 domain controllers, NSCA-DC and NSCA-Files. NSCA-DC is a VM in hypervisor and is my primary DC. Additionally they are both my DNS servers. DNS is resolving for my internal network with no problems. When people VPN in from outside our network my internal server’s names are not resolved. My router is managed by our ISP, but connected to it is a Cisco ASA that is used as a VPN concentrator. I can control its settings.
Also I cannot connect to my primary-DC through RDP but I can PING it and it does have access to the internet. When I open RDP I can connect for credentials, but then it will not establish a connection using either the server name or its IP address.