To me it seems like RDP over VPN is the more secure option provided you trust the machine connecting to the VPN or you have a setup that can verify it is trustworthy before granting it access.

Synology routers are equipped with an easy-to-use GUI management system called 'Synology Router Manager (SRM),' which allows you to set up a remote desktop environment by performing operations such as ...

Network engineer for a small MSP here, I've seen more than my fair share of strange RDP behavior but this one has to take the cake. Quick setup of the scenario: -User was provided information for ...