hilmaadmin

You were right, I spoke with the hosting provider and they managed to fix it.
Problem solved.
Thank you @sinip!

@sinip : when you write “here” does that mean from your computer?
Are you a WordPress admin?

I have tried to open the sites on internet explorer instead of Google chrome, no access.
I have tried accessing with my firewall unlocked, no access.
I have cleared my computer of caches and cookies, still no access.
I will try on another computer tomorrow to see if I can access to the site. It is the only website I don’t have access to, and the first time this happens on my machine.
It seems to me at this moment that the problem is with WordPress and not with my computer.