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:
dl2.boxcloud.com - dl20.boxcloud.com
cdn01.boxcdn.net - cdn20.boxcdn.net
2. Enable HTTPS (port 443) 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 User Services case and request any additional hostnames that are used with Enterprise accounts.
Configuring a Proxy for Box Sync
1. What client settings are supported?
- Automatic Proxy Detection
- Proxy Auto-Configuration (PAC file)
- Manual setting: Select Web Proxy (HTTP) and Secure Web Proxy (HTTPS) and enter the IP address or host name for your proxy server
2. What server settings are supported?
- Proxy server without authentication
- Proxy server with NTLMv1 or NTLMv2 authentication
3. What are the proxy exceptions?
- Windows: The Windows API does not support local file path schema (file://C:\proxy.pac). Box Sync works if the PAC file path starts with HTTP or HTTPS, but it doesn't work if the PAC file path is the local path.
Configuring a Proxy for Box Edit
Testing Connectivity to Box Domains
You can test if your browser is able to connect to various Box domains by going to our Connectivity Testing page. Each test image is hosted on a different Box domain.