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I have a domain registered with Godaddy. It has a wildcard CNAME for "www". I have tried to make a sudbomain: mysubdomain.mysite.com.

However the external DNS doesn't seem to be routing at all.

IN IIS, I simply have a binding with: "www.mysubdomain.mysite.com", all IPS.

Do I need to set up explicit cname entries for each subdomain?

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  • Are you having problems with lookups to mysubdomain.mysite.com, or to www.mysubdomain.mysite.com? Jun 20, 2013 at 6:56
  • So, you've set up *.mydomain.com to point to www.mydomain.com? Jun 20, 2013 at 7:15
  • So looks like my setting are: 1. wild card A record to my IP. 2. wild card cname to "www". host. I'm having trouble with both, but I'm only expecting "www" to work because, thats what my IIS binding is. Jun 21, 2013 at 3:05

2 Answers 2

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The is because a restriction on CNAME,

An alias defined in a CNAME record must have no other resource records of other types (MX, A, etc.)

and according to RCF1034

If a CNAME RR is present at a node, no other data should be present; this ensures that the data for a canonical name and its aliases cannot be different. This rule also insures that a cached CNAME can be used without checking with an authoritative server for other RR types.

So all your subdomain records should not work.

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  • So how do I get this working? Jun 21, 2013 at 3:03
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Solution was to just add an explicit A record for the exact subdomain, (despite the fact that the wildcard was there)

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