UPDATE 24-Sep-15 11:00am PDT: We have confirmation from users of Telefonica/Movistar that the issue has been resolved by the ISP in Spain.
UPDATE 23-Sep-15 12:30pm PDT: We have determined this issue is being caused by Telefonica/Movistar, and we are reaching out to their NOC for resolution.
As a workaround: Users in Spain can access Box through some alternate Box domains. Please contact us at https://community.box.com/t5/Help/ct-p/Support
and we can share the domains via a Support Case.
UPDATE: This access issue with Spain-based users continues due to some issues with Telefonica/Movistar ISP.
If you continue to see issues with connecting from Spain please report this issue directly to your ISP. The Box services are functioning normally.