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https://issues.apache.org/jira/browse/NIFI-12317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18008805#comment-18008805
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David Handermann commented on NIFI-12317:
-----------------------------------------
Apache NiFi 1 reached end of support in December 2024, so support for the
Client Credentials Flow is limited to Apache NiFi 2.
> REST API Rejects Keycloak OIDC Access Tokens with HTTP 401
> ----------------------------------------------------------
>
> Key: NIFI-12317
> URL: https://issues.apache.org/jira/browse/NIFI-12317
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Security
> Reporter: Anmol
> Assignee: David Handermann
> Priority: Major
> Fix For: 2.0.0-M3
>
>
> I have integrated Nifi with keycloak and NIfi UI is working fine. But if i am
> hitting nifi-api with keycloak access token , nifi is giving 401 error.
>
> error: Unauthorized error="invalid_token", error_description="An error
> occurred while attempting to decode the Jwt: Signed JWT rejected: Another
> algorithm expected, or no matching key(s) found",
> error_uri="https://tools.ietf.org/html/rfc6750#section-3.1";
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