Manual setting: Select Web Proxy (HTTP) and Secure Web Proxy (HTTPS) and enter the IP address or host name for your proxy server
Proxy Server Settings
Proxy server without authentication
Proxy server with NTLM AD authentication
Windows: The following exceptions apply to both Sync 3 and Sync 4.
Box Sync for Windows does not work with NTLM V2 .
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 if it doesn't work if the pac file path is the local path.
Mac: Box Sync only supports manual configurations on Sync 3.