OpenIdConnectProtocolNonceException in OIDC SSO page

Banu 40 Reputation points
2025-06-09T06:07:21.4633333+00:00

Hi,

Have implemented SSO - oAuth (OIDC protocol) authentication has been implemented in my project (.Net Framework 4.8 Webforms project). Everything is working as expected. But, if I leave SSO login page without logging in for some time, then if I try to login, I am getting the exception OpenIdConnectProtocolNonceException. Have attached the exception details.

I have added AuthenticationFailed notification, but it is not getting fired. Kindly advise.

SSO_Page_Error.PNG

Developer technologies C#
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