Mumu/SWEX problem

So I got this weird issue with Mumu after reinstalling my computer.

After setting up SWEX as a proxy to capture the json files, the game gives me a "Failed to connect with the network" error as soon as it starts.

Cert is brand new, proxy is started and actually listening, mumu is configured to connect to the right ip & port. If i remove the proxy in the "wifi" settings, game works fine. But as soon as I configure it, can't play anymore. Tried both x86 and x64 versions, issue is the same.

Anybody got an idea how I could go around to solve this?