I'm using an s8 + and recently we got a "security update". Before this update, I was able to access the settings of my wifi> advance> configure proxy in manual and add the IP address plus the port.
Now, every time I do this, my phone does not change the settings, it's almost as if the "save" button does not work. As soon as I leave the page, my proxy settings are reset to "none".
I saw a post about possible applications that could alter it, but I have not installed any new or updated application, this problem started right after the last update.