I tried to map a custom domain name for a site that I created in Google App Engine. However, the user domain does not apply to the site. Below are the steps that I followed after checking Google Help Sites and stackoverflow responses.
1. Created / uploaded Google App Engine website
http://myGoogleSite.appspot.com/
2. Domain name purchased
mydomain.com
3. Created a CNAME record with a domain name provider
Name: www
Value: ghs.google.com
4. Created a Google Apps account
https://www.google.com/a/mydomain.com
5. Verified domain name in Google Apps account
6. Included services for Google App Engine.
Added site http://myGoogleSite.appspot.com/ (Created in step 1)
7. Google Admin Panel
Settings> Select Google App Engine Website
Added new web address
http://www.mydomain.com
RESOLVED
The problem was resolved without any changes after a day. I think the CNAME record that I added on the domain name server got applied in a day. Although I tested it through dnsstuff.com that day, and they were correctly reflected.
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