While traveling it is nice to have access to your home network. Sometimes you want to watch a TV show (or Formula One race). I have setup OpenVPN for that on one of my servers. The certificates expire after a given period of time. I set my certs to expire after a year. Every year I have to look up how to do that, but now I have this post.
- Go into menu System -> Certificates
- Click the Reissue/Renew icon right from the expired certificate(s) (for both OpenVPN Certificate Authority and the VPN user)

- Go to menu VPN -> OpenVPN
- Select tab Client Export
- At the bottom of the page, under section Client Exports, click the type of export you need.

- Use the exported file in your OpenVPN client