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Custom Domain DNS Addresses And Name Addressing Conventions

Periodically, when reviewing the many problem reports about Google Custom Domains, and especially those reporting the ubiquitous "Another blog ..." error message, we'll look at the DNS configuration and see a partial DNS setup 900 IN CNAME

yet the blogger reporting the problem states
I setup my domain with both the root, and the "www" alias, defined. This is what I setup! Whatever can the problem be?  3600 IN A  3600 IN A  3600 IN A  3600 IN A 900 IN CNAME

We look deeper, and find not the above, but  3600 IN A  3600 IN A  3600 IN A  3600 IN A 900 IN CNAME

or maybe  3600 IN A  3600 IN A  3600 IN A  3600 IN A 900 IN CNAME


This is a typical problem with many GUI Domain Managers, where "" is already known to the wizard (look at the top of the Domain Manager display). When you specify a "CNAME" for "", in the "CNAMES (Aliases)" entry, you don't specify "", you simply specify "www". Specifying "" for "CNAMES (Aliases)" results in 900 IN CNAME

Similarly, specifying "" for "A (Host)" results in 900 IN CNAME

This will not always be the case, unfortunately. Some DNS Manager wizards automatically extract redundant "" phrases from the "A (Host)" and "CNAMES (Aliases)" entries. Others, like GoDaddy, do not.

For GoDaddy and some (not all) similar wizards
  • To designate "": Enter "@" (that's a Shift-2, on most keyboards), under "A (Host)".
  • To designate "": Enter "www", under "CNAMES (Aliases)".

If you have a third party DNS Host (not eNom or GoDaddy), you are responsible for finding out how they signify the domain root, when entering the "A (Host)" and "CNAMES (Aliases)" records. Try and prevent  3600 IN A  3600 IN A  3600 IN A  3600 IN A 900 IN CNAME

or  3600 IN A  3600 IN A  3600 IN A  3600 IN A 900 IN CNAME

and eliminate one possible cause for the "Another blog ..." error.


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