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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Help › Desktop Synchronization?
Our engineers are currently in the process of developing desktop synchronization for Box.net users; the beta version should be available in the upcoming months.