Sometimes they work, and sometimes I have to close one or the other, or every connection gets blocked. I haven’t blocked anything from Proton VPN on Portmaster - just some Windows services and domains that don’t break the internet when Proton VPN is off.
Do you have any idea what may be happening or how I can discover what’s going on?

• both on the free plan.

Edit: I might have figured it out. It seems like they are fighting over DNS resolving. When I removed the DNS settings from Portmaster (it’s already set in the browser anyway), it started working again :)