If you have upgraded Access Manager from 4.4.x to 4.5.x, user authentication using the Generic Class fails. This issue occurs when the Advanced Authentication server certificate is not available in the NIDP trust store.
To workaround this issue, perform the following steps:
On the Home page, click Certificates > Trusted Roots > Auto-Import From Server.
Specify the Advanced Authentication server IP address, server port and the certificate name. The default port value is 443.
Add the certificate to the NIDP trust store.
On the Home page, click Identity Servers > [cluster name] > Edit > General > Security > NIDP Trust Store.
Under Trusted Roots, click Add.
Select the certificate and click OK.