This article describes in detail how to renew password for users that is expired on AD using FortiGate and FortiAuthenticator.
Scope
FortiAuthenticator, FortiGate.
Solution
It is presumed that SSL-VPN authentication with FortiGate and FortiAuthenticator is working, for password renewal it is mandatory to use MSCHAPv2 on FortiGate and FortiAuthenticator.
In order to renew the password, it is necessary that FortiAuthenticator should be able to join the domain and use LDAPS.
For FortiAuthenticator to join on AD, follow the below KB article and make sure that ‘Use Windows AD Domain Authentication’ is enabled on Radius Policy.
From the AD side, set an user account to expired and select ‘user must change the password’ on the next logon.
From SSL-VPN web portal, try to log in with username/password.
It will be prompted that the password is expired, then select a new one.
After the change, the user is going to authenticate, this can be verified from the debug logs on FortiAuthenticator, https://<fac-ip>/debug and download radius authentication.
From the debug logs, it is possible to see that the user password change is required. This can be done by MSCHAPv2 through ntlm_auth helper and the password change will be successful.
Alex Lim
Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook
