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

Question

After Upgrade iOS from 13.XX to 14.XX l2tp over IPSec Connection stop working.

Sophos User3316 · Accepted Answer

Resolved by changing the L2TP-IPsec policy to the following: 
 IKE Encryption Algorithm - AES 256 
 IKE Authentication Algorithm - SHA2 256 
 IPsec Encryption Algorithm - AES 256 
 IPsec Authentication Algorithm - SHA2 256

Shaun Raven · Answer

Hi, 
 I've heard rumours on the Apple forums that the problem is related to the authentication settings now required by IOS 14 - can someone confirm this? 
 
 Suggested answer from the forums... 
 
 change the IPsec Policy in "Remote Access -> IPsec -> L2TP-over-IPsec (Policy used for L2TP-over-IPsec)"

-> IPsec encryption algorithm: 3DES

-> IPsec authentication algorithm: SHA2 256

I've tried this on our UTM - seems to work.

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

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