The .NET Application might fail to perform login, upload, download operations.

Error Message: .NET API application - Error The following exception occured during ExploreFolderAsync: System.InvalidOperationException: The character set provided in ContentType is invalid. Cannot read content as string using an invalid character set. ---> System.ArgumentException: '"utf-8"' is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.

All the required ShareFile IPs and Domains need to be allowed on the Firewall/ Web Filtering Proxy.
The list of IPs can be found here.