L2tp stop working After iOS Update from 13.7 to 14.xx

I obtained this from Apple regarding this problem

https://support.apple.com/en-us/HT211840

They want me to "truncate the output of the SHA-256 hash to 128 bits" (instad of truncating to less than 128 bits).

First I had no idea, what that is refering to and where I could configure (or even check) such a setting.

Now with the right search terms, I found this: https://support.sophos.com/support/s/article/KB-000036559?language=en_US Following the instructions ther makes the settings RFC-compliant at the cost of perhaps no longer admitting some Android VP clients

I obtained this from Apple regarding this problem

https://support.apple.com/en-us/HT211840

They want me to "truncate the output of the SHA-256 hash to 128 bits" (instad of truncating to less than 128 bits).

First I had no idea, what that is refering to and where I could configure (or even check) such a setting.

Now with the right search terms, I found this: https://support.sophos.com/support/s/article/KB-000036559?language=en_US Following the instructions ther makes the settings RFC-compliant at the cost of perhaps no longer admitting some Android VP clients