Thanks Robert,
Still getting this issue across browsers, incognito modes, on 4G/5G or wifi and different devices.
It’s site wide and for extra information Safari shows this message:
Safari can’t open the page “https://wpusermanager.com” because the server unexpectedly dropped the connection. This sometimes occurs when the server is busy. Wait for a few minutes, and then try again.
I am also experiencing this issue, would love to have this resolved asap!