UTM 9 software as ProtonVPN client

Although this thread is quite old, it's great to see renewed interest in the topic! To answer your question, making Proton act as the parent proxy for the UTM can be a bit tricky but not impossible. It largely depends on your setup and the tools you're using.

Have you checked if Proton now offers support for parent proxy configurations, or are you using a workaround? Sharing more details about your current setup might help others chime in with specific advice. I'm also curious if anyone here has successfully implemented this with recent updates to Proton or UTM!