You mentiioned that this works for other domains, but not 'theocdu'. Is ~theocdu the cPanel username of the hosted account, or is it possibly an addon domain that you added to your regular account?
If 'theocdu' is an add-on domain that you've added to your regular account, and 'theocdu' is the public_html sub-directory for this domain, then try
http://72.29.83.53/~cpanelusername/theocdu/
This is what I've used in the past for a domain that I was adding before Nameservers were updated for the new sub-domain.