Windows 10: VPN(IKEv2) connection failure 87 the parameter is incorrect

This VPN had worked fine a couple of weeks ago before I upgraded the system to the latest release.

Now is Win 10 Pro Version 1809 Build 17763.195


Today I use the same VPN, and a failure occurred, told me the parameter was incorrect.


Here's the error I found in Event Viewer:


CoId={C9393855-0FC8-47EA-85A7-6A32E852F908}: The user SYSTEM dialed a connection named xxx which has failed. The error code returned on failure is 87.

Following the lead, I found the parameters the VPN client sent to the server:


CoId={699573D1-94D0-4F49-9FA6-21485B60DA50}: The user SYSTEM has started dialing a VPN connection using a per-user connection profile named xxx. The connection settings are:

Dial-in User = abbxgt

VpnStrategy = IKEv2

DataEncryption = Requested

PrerequisiteEntry =

AutoLogon = No

UseRasCredentials = Yes

Authentication Type = EAP <Microsoft: Secured password (EAP-MSCHAP v2)>

Ipv4DefaultGateway = No

Ipv4AddressAssignment = By Server

Ipv4DNSServerAssignment = By Server

Ipv6DefaultGateway = No

Ipv6AddressAssignment = By Server

Ipv6DNSServerAssignment = By Server

IpDnsFlags =

IpNBTEnabled = Yes

UseFlags = Private Connection

ConnectOnWinlogon = No

Mobility enabled for IKEv2 = Yes.


Here's the VPN info:


Name : xxx

ServerAddress : (sorry but this is not allowed to leak)

AllUserConnection : False

Guid : {D385C26C-1930-4809-B76C-E44C89BC4F1E}

TunnelType : Ikev2

AuthenticationMethod : {Eap}

EncryptionLevel : Optional

L2tpIPsecAuth :

UseWinlogonCredential : False

EapConfigXmlStream : #document

ConnectionStatus : Disconnected

RememberCredential : False

SplitTunneling : True

DnsSuffix :

IdleDisconnectSeconds : 0


How can I solve this problem, please?

:)

 

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I used this guide here :https://www.digitalocean.com/commun...-ubuntu-16-04#step-4-—-configuring-strongswan;

The server has no issues, the ufw rules, ipsec config and StrongSwan config are all followed exactly as the tutorial shows.

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The issue remains and I post a question in Technet forum
here