SAML authentication request has no issuer - Common causes and quick fixes

SAML authentication request has no issuer – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

Briefly, this error occurs when the Security Assertion Markup Language (SAML) authentication request lacks an issuer. The issuer is a unique identifier for the entity that generated the SAML response. Without it, Elasticsearch cannot authenticate the request. To resolve this, ensure that the SAML response includes an issuer. Check your Identity Provider (IdP) configuration and make sure it’s set to include the issuer in the SAML response. Also, verify that your Elasticsearch SAML settings are correctly configured to accept and validate the issuer.

This guide will help you check for common problems that cause the log ” SAML authentication request has no issuer ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, request.

Log Context

Log “SAML authentication request has no issuer” class name is SamlAuthnRequestValidator.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 });
 }  private void getSpFromAuthnRequest(Issuer issuer; String acs; ActionListener listener) {
 if (issuer == null || issuer.getValue() == null) {
 throw new ElasticsearchSecurityException("SAML authentication request has no issuer"; RestStatus.BAD_REQUEST);
 }
 final String issuerString = issuer.getValue();
 idp.resolveServiceProvider(issuerString; acs; false; ActionListener.wrap(serviceProvider -> {
 if (null == serviceProvider) {
 throw new ElasticsearchSecurityException(

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