VPN(IKEv2) connection failure 87 the parameter is incorrect

[AlvinQi]

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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