Can I run Access Server on a Raspberry Pi?
No. That’s because that system uses an ARM processor, and we haven’t built Access Server for ARM. You might wonder why, since it is a Linux based program, and it should be possible to do so. The main reason aside from it still being a lot of work due to all the dependencies involved and having to support more than one major platform (x86/x64), is simply that ARM is a fairly low-power processor architecture compared to x86/x64. And there’s nothing wrong with that in and of itself; ARM processors definitely have earned their place in the world of computers. But it’s not a platform we would want to launch OpenVPN Access Server on, as people may have unrealistic expectations then. After all, encryption/decryption relies very heavily on the processor to do its work, and aside from that, a SoC platform like a Raspberry Pi has its network interface connected through a USB interface. All of this means you simply cannot get a very good performance out of OpenVPN in general on a Raspberry Pi. So we choose not to support it with our commercial product.
However, you can use the open source OpenVPN program instead. As a client, this could be suitable to connect to an Access Server. It can even be used as a site-to-site VPN gateway client system, although with some limitations on the speed at which it can handle traffic. And if you use the open source OpenVPN program, you can indeed also set it up to function as a server. Just not with the OpenVPN Access Server program, as that is x86/x64 only.
If you are looking for a small format cheap and energy frugal system to run Access Server on you may consider for example an entry system cheap Intel NUC system, or the MinnowBoard. There are dozens of projects out there with boards for development and tinkering that run on x86/x64 and are reasonably cheap.