I want to install a TeamCity BuildAgend as a user. When entering my user credentials here: 

![enter image description here](https://i.stack.imgur.com/U83Bb.jpg)

I always get this error:

![enter image description here](https://i.stack.imgur.com/qhbOb.jpg)

**NOTE: My account (user) is Administrator with full permission!**

How can I do this?