One of the more intriguing causes of intermittent custom domain problems starts with inconsistent DNS server configuration. Recently, eNom, one of the "partners" in "Buy a domain" , has been serving inconsistent DNS configurations , from time to time - including one very blatant episode the afternoon of 6/18/2012, which was reported by several dozen angry blog owners. Detecting, and diagnosing, the inconsistencies is typically a complicated process. Identify the domain authority servers, typically using a Who Is lookup. Dig each domain address (typically "naked domain" and "www" aliases), from each of the identified domain authority servers. Extract and aggregate each Dig log. Compare aggregated Dig snippets. This was not a task for the faint of heart, or tech challenged, blog owner. Recently, I was given a handy tool which does all of this, in one quick GUI transaction.
What Blogger won't tell you