Starting Monday January 23rd 2023, the CDNs that serve downloads of our desktop products (cdn07.boxcdn.net and e3.boxcdn.net) will be migrated to a newer provider. This will not affect access to your content from the Box desktop products. The Box website already uses this provider, so the transition should be transparent to users. However, if you have set up any restrictive firewall rules or custom DNS overrides you will need to update your system settings.
Kindly refer to https://support.box.com/hc/en-us/articles/360043696434-Configuring-A-Firewall-For-Box-Applications, for best practices to configure your firewall settings for Box or contact Box support if you encounter any issues.