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I have a home server that I used to administer remotely via RDP. I simply opened a port on my router and connected. The server is now using the commercial iVPN service, and while I can still connect via the LAN I can't connect from outside any more.
This seems to be because the iVPN client routes all non-LAN traffic through the VPN, so the server is unable to accept connections from the WAN.
I want to avoid relying on third party services to connect to my server, so things like TeamViewer are out. I'm not tied to RDP though, I could switch to VNC. I have a private domain which can host web applications. I could attach something like a RaspberryPi to my LAN if required.
I considered creating a VPN connection in to my LAN. I would rather avoid that level of access if possible, but it's an option I am aware of and would interested if it could be limited to only allowing RDP sessions.
How can I remotely view my server's desktop, ideally with RDP, while it is connected to the VPN?
You should use one of the programs or services you have listed in your question. We can't recomend specific clients, applications, or services as those would all fall under a recomendation. If you want to connect to the server, which is connected to a VPN, then the client also has to connect to the VPN. That is typically how you configure what you want to do. Allowing any client not connected to the VPN woudl be a huge security threat. – Ramhound – 2017-01-20T13:50:56.653
It's possible to set up routing to allow certain, limited connections outside the VPN in a reasonably secure way. Also, if services like TeamViewer can offer assistance to connect without ports open or knowing the server's IP address, then it seems like I should be able to run such a service myself. – user3241 – 2017-01-20T17:37:08.763
Teamviewer uses works without having to forward ports, simply because it connects to the web service, hosted outside of your network. You can use VNC while connected or not connect to your VPN. Of course what address you use would depend if your connected or not connected to the VPN. – Ramhound – 2017-01-20T17:46:01.983