Hi!
I'm trying to open my visualforce pages.  It was working last week, I did some screen capture for documentation purpose.
But today, I got this error for all my pages...

This site can’t be reached
agfaccessgroup--natacha2--c.visualforce.com’s server IP address could not be found.
DNS_PROBE_FINISHED_NXDOMAIN

Any idea on this ?
I tried it on Lightning and on Classic, still get the same error.
It's working on the production environment but it's not working on my sandbox....

thanks