Soner Tari

I still think that the issue may be the client not liking the CA cert you pass to sslproxy (isn't it self-signed?). Can you add the CA cert to the...

No, I think you're right. I've been trying to rule out all usual suspects, and I had assumed you were confused about the "switched" roles of client and server. But...

I don't want to discourage you, but I think it wouldn't be easy to reverse the roles of client and server. (For example, sslsplit/sslproxy expects SNI from client before connecting...

It's more complicated than that.

I don't have a PPPoE setup to develop such a feature, and it doesn't seem likely I will have in the near future. Also, to compete with such alternatives as...

Have you restarted the system after this change? (You could perhaps restart the network and dnsmasq too, but restarting the system may be better.)

The UI does not support IPv6. In fact, I cannot confirm if the underlying UTM services support IPv6 either. Sorry.