When using OpenVPN GUI for Windows, you might notice that it’s impossible (at first) to open more than one connection at the same time. For example one connection to work and another connection to a client’s location.

The error message then shown is that Windows has no TAP adapters available anymore, but it doesn’t tell me how to fix it. Googling didn’t help much either.

The solution is, after all research, very easy. Go to Start > All Programs > TAP-Windows > Utilities > Add a new…

I hope to have saved someone some trouble with this post.