AD Authentication abruptly stops working

The custom AD Authenticator abruptly stops working one day, when no major system changes have taken place. Users who attempt to login receive a message about incorrect username/password, although authentication worked fine the previous day
Browse to the authentication endpoint URL via a browser. It will resemble https://( servername )/Blackbaud%20Gateway/BBADAuth.ashx

If you see the message "This server could not prove that it is (servername); its security certificate expired yesterday."
Then update the security certificate on this server. Then retry authentication, and it should be successful.


 Blackbaud CRM

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