How to configure heroku application DNS to Godaddy Domain?

There are 2 steps you need to perform,

1. Add the custom domains addon and add the domain your going to use, eg www.mywebsite.com to your application
2. Go to your domain registrar control panel and set www.mywebsite.com to be a CNAME entry to yourapp.herokuapp.com assuming you are using the CEDAR stack.
3. There is a third step if you want to use a naked domain, eg mywebsite.com when you would have to add the IP addresses of the Heroku load balancers to your DNS for mywebsite.com

You can read more about this at http://devcenter.heroku.com/articles/custom-domains

At a guess you've missed out the first step perhaps?

UPDATE: Following the announcement of Bamboo's EOL proxy.heroku.com being retired (September 2014) for Bamboo applications so these should also now use the yourapp.herokuapp.com mapping now as well.

I used this videocast to set up my GoDaddy domain with Heroku, and it worked perfectly. Very clear and well explained.

Note: Skip the part about CNAME yourdomain.com. (note the .) and the heroku addons:add "custom domains"

http://blog.heroku.com/archives/2009/10/7/heroku_casts_setting_up_custom_domains/

To summarize the video:

1) on GoDaddy and create a CNAME with

Alias Name: wwwHost Name: proxy.heroku.com

2) check that your domain has propagated by typing host www.yourdomain.com on the command line

3) run heroku domains:add www.yourdomain.com

4) run heroku domains:add yourdomain.com

It worked for me after these steps. Hope it works for you too!

UPDATE: things have changed, check out this post Heroku/GoDaddy: send naked domain to www

The trick is to

1. create a CNAME for www.myapp.com to myapp.heroku.com
2. create a 301 redirection from myapp.com to www.myapp.com