macOS Catalina

Using Catalina’s inbuilt VPN (racoon) where is it possible to change the SHA-256 hash to 128 bits?

I have racoon running in Catalina and have configured it for connections.

Users on the local network can connect instantly with no issues.

But

Any connections from outside (WAN) are seen but the connection fails

extract from the vpnd.log

2019-11-12 09:23:14 AEST Incoming call… Address given to client = 192.168.0.252

Tue Nov 12 09:23:14 2019 : publish_entry SCDSet() failed: Success!

Tue Nov 12 09:23:14 2019 : publish_entry SCDSet() failed: Success!

Tue Nov 12 09:23:14 2019 : publish_entry SCDSet() failed: Success!

Tue Nov 12 09:23:14 2019 : L2TP incoming call in progress from '124.170.90.89'…

Tue Nov 12 09:23:14 2019 : L2TP received SCCRQ

Tue Nov 12 09:23:14 2019 : L2TP sent SCCRP

2019-11-12 09:23:18 AEST Incoming call… Address given to client = 192.168.0.253

Tue Nov 12 09:23:18 2019 : publish_entry SCDSet() failed: Success!

Tue Nov 12 09:23:18 2019 : publish_entry SCDSet() failed: Success!

Tue Nov 12 09:23:18 2019 : publish_entry SCDSet() failed: Success!

Tue Nov 12 09:23:18 2019 : L2TP incoming call in progress from '124.170.90.89'…

Tue Nov 12 09:23:18 2019 : L2TP received SCCRQ

Tue Nov 12 09:23:18 2019 : L2TP sent SCCRP

2019-11-12 09:23:27 AEST –> Client with address = 192.168.0.254 has hungup

2019-11-12 09:23:28 AEST –> Client with address = 192.168.0.250 has hungup

2019-11-12 09:23:30 AEST –> Client with address = 192.168.0.251 has hungup

2019-11-12 09:23:34 AEST –> Client with address = 192.168.0.252 has hungup

2019-11-12 09:23:38 AEST –> Client with address = 192.168.0.253 has hungup

Investigating this I have found reference to changing the SHA-256 hash to 128 bits but have been unable to find where this is achieved.

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