Remote RDP session via Windows PPTP VPN fails

[jgdempsey_harris]

I have a 64bit Windows 7 Enterprise(service pack 1) Guest (with the latest updates) running on Virtual Box 4.3.30 r 101610, on a 64bit Windows 7 Enterprise (service pack1) host (with the latest updates) that I use for remote support for our clients.
This is via a bridged connection to the Host wired Adapter (Intel I217-LM).

I have two clients that I connect to via Windows PPTP VPN (their choice, so I have no say in it), after which I need to connect via RDP to a Windows desktop machine. In both situations, RDP fails, after inputting my credentials, with the error "An internal error occured" (very descriptive isn't it).

If I attempt the same connections via the host machine, I do not get the error, so the issue seems to be with Virtualbox or it's configuration.

I have tried a couple of other clients with RDP capabilities (Royal TS, and mRemoteNG) with the same result(probably using the underlying MS RDP software anyway).

Any assistance would be appreciated.

JD

[jgdempsey_harris]

I was able to solve the problem.
I had two network adapters enabled on the VM (Wired and wireless) and had attempted to switch between them depending on whether I had a wired connection available or was using wireless. I disabled the second adapter, and then just switched between the different host interfaces on Adapter 1 and I was able to connect to the RDP session via PPTP VPN.

It also solved a problem I was having with connecting from the VM to the outside world via the wireless interface.

[Legorol]

Very nice of you to have posted the resolution when you found it, most people don't bother. It is useful information.