Error 404 on CNAME forward

Question

In my DNS manager, GoDaddy I made some A Record that points to *.mirror for my domain

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Now when I access URL 123.mirror.mydomain.com from the browser I can see that my app is loaded, and its all OK.

My problem now is when doing a CNAME point to the URL above on another domain DNS manager like this:

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Accessing 123.otherdomain.com which I expect to "forward to" 123.mirror.mydomain.com I only get this 404 error:

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What I am missing here?

David Houde · Answer 1 · 2014-08-23T12:10:53.993

1

When you try to access a domain with a CNAME record in your browser, two things of significance to this question happen.

1: The browser determines the IP address to connect to. This means that the browser will follow the CNAME record of 123.otherhost.com to the IP of 123.mirror.yourdomain.com

2: The browser will request the page with a host header that is equal to the domain entered in the address bar. This means the browser will request the page from http://123.otherdomain.com

It sounds like you may want to alias 123.otherdomain.com and 123.mirror.yourdomain.com in the same virtual host.

edited Aug 23 '14 at 12:10

answered Aug 23 '14 at 12:03

David Houde

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You mean its not possible to achieve this? – cyberquarks Aug 23 '14 at 12:46
My ultimate goal is to be able for 'anydomain.com' CNAME www to point to my app subdomain – cyberquarks Aug 23 '14 at 12:48
Yes, but you would need to configure your app.subdomain to also include the alias anydomain.com or *.anydomain.com, etc. – David Houde Aug 23 '14 at 12:57
Do you mean that in GoDaddy console for my domain, say mydomain.com I will need to add all the domains I need to point to it, like abc.com, xyz.com or anydomain.com? – cyberquarks Aug 23 '14 at 13:11
How can I add alias of anydomain.com on my control panel for mydomain.com – cyberquarks Aug 23 '14 at 13:28
You need to configure the alias on your **web server**, so it accepts both it's main domain name and the new `123.otherhost.com`. – NuTTyX Aug 23 '14 at 15:26

Error 404 on CNAME forward

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