Hi James, 

Welcome to the Box Community!

Can you please make sure to configure your VPM or proxy to allow Box access and follow the steps in this article: Configuring a Firewall for Box Applications

You may need to contact your IT department to help in allowing Box as a trusted source.

Thanks for posting in the forum and let us know how else we can help!

Best,

I am retired and don't have an IT department but have over 40 years computer experience.  It's not the firewall because I turned off the firewall and had the same problem.  I can't even log into this forum if I have the VPN active!