Horizon - Failed to connect to the server

I’m trying to use Horizon today and when I start it the message “Failed to connect to the server” appears and I can’t use the program’s main features.
I’ve already tried all the solutions presented on the forum, disabling firewall, disabling antivirus, deleting directories, etc. Two friends tried to connect and had the same problem.
Thanks

I am also having the same issue. Might just be the tool itself down right now.