Three subdomains and 404 errors?

Hosting Support
#1

First subdomain works. The second loads for and is visible for half a second and then goes to 404. The third works but is stapled as unsafe?

#2

What are the subdomains? Checking an issue is so much easier if people know what to check.

#3

courselink.uoguelph.cf
webadvisor.uoguelph.cf
webadvisor3.uoguelph.cf
Are the three subdomsins.

#4

All of those subdomains are working fine as far as I can tell. They show website content. Could you try to clear your browser cache and then try again?

#5