Unable to switch Security Level

Is there a problem with the security level switch?

Before, once I switch the under attack mode, it will activate instantly. But now, even though the dash indicates my site is in “under attack” mode, I still do not see the challenge page up (Yes, I verified by using different IP/device). I switch on/off a few time, but nothing worked.

Probably not. I just tested it on a site of mine and it blocked fastorslow from testing the site.

OK, it is up now. After I switched around 10 mins ago. Just wondering why it takes so long now.