Hi @GianlucaTarantino, welcome to the Glitch forum!
As previously noted this seems like you might be being blocked from accessing Glitch somewhere along the line. I’m a little surprised; I know we have folks using Glitch located in many places and I have yet to hear of this wide a ban. We have had folks blocked from using Glitch on their work network in the past, for instance, but switching to mobile data showed they could access it there and they were able to work it out with their network engineers. However it sounds like you’re being blocked there too.
Unfortunately there’s not much we can do to help with this - it’s not really a Glitch problem. I suppose you might be able to use some sort of VPN to access Glitch, but I don’t know what might be available to you on that end.
It seems as though you’re able to load the Editor though, correct? Is it just glitch.me addresses you can’t access? If so, perhaps you could use a custom domain to get around that limitation?