HTTP ERROR 403: No valid crumb was included in the request - while rorating sso

Using Jenkins
1

We have enabled SSO in Jenkins using the miniOrange SAML SSO plugin, and the login flow is working as expected.

However, after the recent certificate rotation, the configuration test is failing with the following error:

HTTP ERROR 403: No valid crumb was included in the request

The failure occurs on the miniOrange SAML SSO configuration page when testing the IdP settings. This started after the certificate update, so it appears to be related to the new certificate or the way the configuration request is being submitted.

Could you please help us review whether the updated certificate needs to be re-imported or whether any Jenkins/miniOrange CSRF or session-related setting needs to be adjusted after rotation?

Plugin in use:
miniOrange SAML SSO