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Configuring a Firewall for Box or Box Sync

When configuring your firewall to allow Box as a trusted source, please use the steps outlined below:

1. Use our site's domain names instead of a particular site IP address as IP addresses can change frequently and without notice. Please configure host names to recognize any sub-domain of:



If you are unable to use wildcards as shown in the list above, please allow these specific hostnames:,,,,[1],,,,,,,,,,,,,,,,

[1] is a new addition to the list above.

Box Sync specific servers include:,,,,,,,,, and *

2. Enable HTTPS (port 443) and HTTP (port 80) for the domains above.

Due to the numerous firewalls available we cannot provide specific instructions for each firewall beyond what is listed above. If you are using a firewall or proxy such as Websense, Blue Coat, etc., please create a Box Technical Support ticket  and request any additional domains or custom subdomains that may be required.

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