The IP address of the server that was the source of the error.
- iOS 4.3+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 6.0+
The property corresponds to “s-ip”.
The value of this property can be either an IPv4 or IPv6 address, and may be
nil if the address is unknown.