It appears that your firewall may be blocking Box.net or you are encountering an error.

Please contact your IT administrator to configure your firewall to recognize all sub-domains of .box.net and .boxcdn.net. The ports that should be opened for these domains are 80 and 443.

If that does not resolve the issue, then please submit a support ticket at http://www.box.net/help.
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Public Box is no longer a supported feature of Box.net. Please contact the account owner for more information.
If you are the owner of this account, we encourage you to leverage the new 'Global Folder' feature on Box.net. To use Global Folder:
  1. Move, copy or upload files you want to share publically into one folder.
  2. From the Share command, click "Customize this address and make global" OR From the Folder Options area on the sidebar, click "Customize Folder URL".