To make sure that your iOS 13 and macOS Catalina clients can connect to your IKEv1 or VPN server, configure the server to truncate the output of the SHA-256 hash to 128 bits. Truncating to a smaller number of bits might cause the server to drop data that VPN clients transmit.
VPN enhancements in iOS 13 and macOS Catalina
Starting with iOS 13, IPsec supports HMAC-SHA-256 with IKEv1 VPN.
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