Horizon "Failed to connect to server" error

I have recently tried download Horizon to my computer. It finishes its download, but when I go to load it, it says “Failed to Connect to Server”. I’m not sure how to fix this problem, anybody have some suggestions?

P.S-I don’t have avast security.

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(I changed the title into something more descriptive and also moved this topic to the correct category. ) Do you have any anti-virus software installed?

Yes, I have CCleaner

CCleaner isn’t an anti-virus software. It cleans your hard drives and offers other cleaning options. In no way would it interfere with Horizon connecting to the server.

It could be Windows firewall or the AV that you do have, if you have one. Try making an exception in them for Horizon, or temporarily disabling them while you use Horizon. Try that and see if it fixes the issue.

try doing this Error message upon trying to open