Some page cant be tested

Hi everybody, i have doubts about why some page cant be tested, now i have one in mind from my conuntry:

I would like to know why this site cant be tested, what have this page to avoid or refuse the test.

Best regards.

The error that test send is :

First View
(Error: 2147483647)

Is this site even accessible over the public internet? If a website is being a corporate proxy, it can’t be tested using the public WebPage Test.

I checked the domain in ports 80,8080, 443 and 8443. The site can’t be reached on these ports. Maybe there is some firewall rule blocking external requests?