Exception while attempting to validate SAML Signature – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch fails to validate the SAML (Security Assertion Markup Language) signature. This could be due to incorrect configuration, mismatched certificates, or an invalid SAML assertion. To resolve this, ensure that the SAML configuration in Elasticsearch is correct, the certificate used for signing the SAML assertion matches the one in Elasticsearch, and that the SAML assertion is valid. Also, check for any network issues that might be preventing Elasticsearch from accessing the SAML Identity Provider.

This guide will help you check for common problems that cause the log ” Exception while attempting to validate SAML Signature ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Exception while attempting to validate SAML Signature” classname is SamlObjectHandler.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                logger.trace("SAML Signature failure caused by"; e);
                return false;
            } catch (Exception e) {
                logger.warn("Exception while attempting to validate SAML Signature"; e);
                return false;
        final List credentials = idp.getSigningCredentials();
        if (credentials.stream().anyMatch(predicate) == false) {


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