@Dave-H Of course there are differences. HTTPSProxy ran from the very first I tried to access MU without any problems. Configuring was very easy. ProxHTTPSProxy didn't run from the very first. I had a lot of trials to get it work. Configuring wasn't easy. I had certificate problems too. In HTTPSProxy the certificate management is much easier. Beyond that HTTPSProxy is more user-friendly compared to ProxHTTPSProxy and can be accessed in SysTray at any time incl. switching on and off. By the way did you try my attached ProxHTTPSProxy's config,ini in this post? For me it is working smoothly.