I forgot to ask another question. At the moment my laptop (running the client) connects using a Laptop.crt & Laptop.key files created by “./build-key Laptop” to my desktop running the server: I followed the procedure from Ubuntu’s Community Documentation for Ubuntu Server OpenVPN. Am I correct in stating that the same server configuration file & created ca.crt file will still work for user/password authentication from the client? The reason that I want to do this is that it seems a good idea to use user/password authentication for Android devices (since, if I lost an Android device, then without this authentication, someone could use my VPN) but not for my Ubuntu laptop as that’s much more secure.