I setup a subdomain for my domain rileyshaw.com called blog.rileyshaw.com but it can't be reached. This morning it was working but I tried to add masking and everything got gummed up. Now I have a cname for blog.rileyshaw.com and www.blog.rileyshaw.com pointing to the same heroku app but the page isn't being found.
The other people who asked this get responses like "we fixed it" so I don't know if I have the same problem or not. I'd appreciate any help!
Changes to the DNS can take a few hours to resolve.
Usually www isn't added to subdomains. If you want to have it just in case I suggest forwarding www.blog.yourdomain.com to blog.yourdomain.com using Permanent (301) Forward Only because both address would lead to the same site.