Verify failed using jwksStrength size of jwks size provided JWKs – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch fails to verify the JSON Web Key Set (JWKS) during the authentication process. The number of keys used for verification is less than the total number of keys provided. This could be due to invalid keys, incorrect configuration, or network issues. To resolve this, ensure that the keys are valid and correctly configured. Also, check your network connectivity and firewall settings to ensure that Elasticsearch can access the JWKS. If the problem persists, consider increasing the number of keys used for verification.

This guide will help you check for common problems that cause the log ” Verify failed using ” + jwksStrength.size() + ” of ” + jwks.size() + ” provided JWKs. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Verify failed using ” + jwksStrength.size() + ” of ” + jwks.size() + ” provided JWKs.” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 jwk.getKeyOperations() == null ? "[null]" : jwk.getKeyOperations()
 }  throw new ElasticsearchException("Verify failed using " + jwksStrength.size() + " of " + jwks.size() + " provided JWKs.");
 }  public static JWSVerifier createJwsVerifier(final JWK jwk) throws JOSEException {
 if (jwk instanceof RSAKey rsaKey) {
 return new RSASSAVerifier(rsaKey);


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