Windows 10 VPN Error 788

  • Thread starter Thread starter Syafii Azami
  • Start date Start date
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Syafii Azami

Hi there, recently I got this error when connecting to "L2TP/IPSec with certificate" VPN. I'm not sure what cause this.

I have already follow some of this steps with no luck :

  • Adding AssumeUDPEncapsulationContextOnSendRule
  • Restarting both IKE and IPSec services
  • Allowing both CHAP and MS-CHAP v2
  • Reset network connection
  • Connect to different provider
  • Re-adding VPN settings

There also little bit information can be found in the event viewer :


CoId={AEE0E2A8-34DF-41BB-B5F0-0458EFD41751}: The user xxx\xxx has started dialing a VPN connection using a per-user connection profile named yes. The connection settings are:
Dial-in User = *\
VpnStrategy = L2TP
DataEncryption = Requested
PrerequisiteEntry =
AutoLogon = No
UseRasCredentials = Yes
Authentication Type = PAP
Ipv4DefaultGateway = Yes
Ipv4AddressAssignment = By Server
Ipv4DNSServerAssignment = By Server
Ipv6DefaultGateway = Yes
Ipv6AddressAssignment = By Server
Ipv6DNSServerAssignment = By Server
IpDnsFlags =
IpNBTEnabled = Yes
UseFlags = Private Connection
ConnectOnWinlogon = No
IPsec authentication for L2TP = Machine certificate.


CoId={AEE0E2A8-34DF-41BB-B5F0-0458EFD41751}: The user xxx\xxx is trying to establish a link to the Remote Access Server for the connection named yes using the following device:
Server address/Phone Number = xxx.xxx.xxx.xxx
Device = WAN Miniport (L2TP)
Port = VPN3-1
MediaType = VPN.


CoId={AEE0E2A8-34DF-41BB-B5F0-0458EFD41751}: The user xxx\xxx dialed a connection named yes which has failed. The error code returned on failure is 788.

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