Cannot Access Report Manager Website By Hostname, Only By IP Address...?

Hello all - this has now happened to me on a few occasions (different installs, different sites, etc.), but my client PCs cannot access Report Manager by the server's hostname (even though I can ping by hostname from the client).

For instance, if I try:

http://ovenserver/reports

I get the infamous "Internet Explorer cannot display the webpage" message.

If I try:

http://10.0.0.20/reports

The Report Manager loads properly without a hitch.

I know I am missing something simple here - can anyone help?

Thanks!