- Go to https://dashboard.heroku.com/apps
- Click on the name of your app
- Click on "Zerigo DNS Zerigo Basic" and click "Configure". You should see your custom domain name listed under "Host Records."
- Click "Add Snippet". Choose "Heroku" from the dropdown menu.
- Click "Add Selected Records".
- Go to the CNAME entry under host records and click "Edit". Change data from
proxy.heroku.com
toYOURAPP.herokuapp.com
I also had to do the following:
- Go back to https://dashboard.heroku.com/apps
- Click on the name of your app
- Click on Settings
- Under "Domains" add your custom domains e.g. mydomain.com. I also had to add one starting with "www."
You may have to wait 10-15 min for the settings to propagate.