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Although VPN connections under Android 7.1.2 worked for me, they do not work under Android 8.0.0 anymore. (IPSec Xauth PSK)

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Steps to reproduce
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Frequency
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Expected output
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Current output
What is the current output?

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Hi I Am experiencing the same issues as mentioned by the topic starter. I've tried to create a bug report, but i haven't rooted my device. However, i have attached the log of my VPN-router below.

Steps to reproduce
Configure a L2TP / IPsec PSK VPN using the native VPN client on Android 8 and try to connect

Frequency
Issue occurs 100% of the time.

Expected output
Connected to VPN

Current output
Message that connection failed.

Router log (IP-ADRES = the IP address of the Android)

2017-10-20 13:12:21     [IPSEC/IKE][Local][66:-][@IP-ADRES] may be security method/sbunet setting/GRE setting unmatched?
2017-10-20 13:12:21     [IPSEC/IKE][Local][66:-][@IP-ADRES] state transition fail: STATE_QUICK_R0
2017-10-20 13:12:19     sent MR3, ISAKMP SA established with IP-ADRES. In/Out Index: 66/0
2017-10-20 13:12:19     Matching General Setup key for dynamic ip client...
2017-10-20 13:12:19     NAT-Traversal: Using RFC 3947, no NAT detected
2017-10-20 13:12:19     Accept Phase1 prorosals : ENCR OAKLEY_AES_CBC, HASH OAKLEY_SHA
2017-10-20 13:12:19     Matching General Setup key for dynamic ip client...
2017-10-20 13:12:19     Find Phase1 proposal: SHA2_256
2017-10-20 13:12:19     Matching General Setup key for dynamic ip client...
2017-10-20 13:12:19     Find Phase1 proposal: SHA2_256
2017-10-20 13:12:19     Matching General Setup key for dynamic ip client...
2017-10-20 13:12:19     Matching General Setup key for dynamic ip client...
2017-10-20 13:12:19     Responding to Main Mode from IP-ADRES

Thanks for looking into this and good luck!

Steps to reproduce:
1. Setup VPN connection using IPSec Xauth PSK with IPSec key
2. Connect to VPN server
3. Connection attempt will fail

Frequency
100%

Expected output
Connect to VPN server successfully

Current output
Connection attempt fails