I am unable to access some websites like http/dictionary.cambridge.org/dictionary while connected via WiFi. However, when directly connected through a dongle/datacard to the internet, I am able to access the websites. I have Kaspersky antivirus and it appears to a some issue with Firewall settings. Please advise.
I too got a 404, but I got into the site, Cambridge main page is there, then I click menu item dictionary and am in. This signals an issue with the Cambridge site, is not your WIFI, I dunno why it worked with your hard-wire. Don't think too much about guy, Internet is not perfect, you get in, move on.