There are a few threads with questions similar to this one, but none that I've found which are the same and resolve my question.
I am having trouble accessing just one particular website from my computer and mobile phone, but only on one particular network (my home). When I try to access it from Google Chrome, I get a message: "This site can't be reached [... website] took too long to respond." This problem persists even if I use different browsers, and also on different devices. If I use a VPN, however, everything loads fine.
I assume that this means that it is the network itself which needs to be adjusted, but I don't know what needs to be done.