Custom domains, to the typical blogger, should be incredibly simple to setup. Functionally, the setup process is two simple steps . Create a DNS entry for the URL of your choice, pointing to Google. Publish the blog to the URL. But for all of that simplicity, they are seemingly random in their failures. Why are custom domains so apparently randomly unreliable ? One example, where we can see random behaviour, is in surgical DNS changes. One of the recent causes of the flood of Another blog is already hosted at this address. and Server Not Found Error 404 is a reference to a DNS server that isn't in service any more . Many bloggers, lately, complain of the "Server Not Found Error 404" symptom. I'll look at an HTTP Access Log for the domain, and see Host IP address = 66.249.81.121 followed by <h1>Server·Not·Found</h1>(LF) <h2>Error·404< /h2>(LF) Next, I look at an excerpted Dig log for the domain, and see mydomain.com. 3600 IN A...