Client Web Service calls gets aborted

Problem

When doing a Client Web Service call in ZervicePoint via Internet Explorer you get no result, even though all settings are correct and the Powershell scripts work.

In the Developer tools under Network you see the calls get aborted.

Solution

In Internet Options → Advanced tab → Security, uncheck the checkbox at Enable Enhanced Protected Mode and restart Internet Explorer. There is a note saying you need to reboot the computer, but on Win2012 R2, IE 11 and restarting the browser is sufficient.