Horizon won't connect to server

When I try to run horizon as a administrator the horizon logo pops up then disappears, right after that a popup appears that says can’t connect to server

I am not running a antivirus
please help!

Same here

Hi, the link from there does not work, it sends you to a blank page, please help with that link and the solution that I can do is not useful either. Please help me what can I do?

It worked for me