I have installed NPS in Server 2016 and configured the policy with MS-CHAPv2 (also tried with PEAP, EAP etc..) and the authn is failing with event id 4625. NTLM v1 and LM is disabled in the domain .


It seems to be a known issue and documented the workaround in here - https://support.microsoft.com/en-us/help/2811487/lt2p-ipsec-ras-vpn-connections-fail-when-using-ms-chapv2 , but unfortunately it is not working in my case, my guess is that may be Server 2016 is not honoring that reg value.


Any suggestions or thoughts?



An account failed to log on.



Security ID: SYSTEM

Account Name: servername$

Account Domain: Domain

Logon ID: 0x3E7


Logon Type: 3


Account For Which Logon Failed:

Security ID: NULL SID

Account Name: blah123

Account Domain: Domain


Failure Information:

Failure Reason: Unknown user name or bad password.

Status: 0xC000006D

Sub Status: 0xC000006A


Process Information:

Caller Process ID: 0x3f4

Caller Process Name: C:\Windows\System32\svchost.exe


Network Information:

Workstation Name: -

Source Network Address: -

Source Port: -


Detailed Authentication Information:

Logon Process: IAS


Transited Services: -

Package Name (NTLM only): -

Key Length: 0


This event is generated when a logon request fails. It is generated on the computer where access was attempted.


The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.


The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).


The Process Information fields indicate which account and process on the system requested the logon.


The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.


The authentication information fields provide detailed information about this specific logon request.

- Transited services indicate which intermediate services have participated in this logon request.

- Package name indicates which sub-protocol was used among the NTLM protocols.

- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.