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.
Manage and Share your files online securely with Box.net. Sign up now. Have a Box account? Log In
Help › Hosting a website with Box.net?
Box.net is a file storage and collaboration service. You will be unable to host a website by simply uploading web page files to your Box.net account. However, you can easily store media files on Box.net and link them to your web page using the 'Direct Linking' feature.