Failed to parse SAML message – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

Briefly, this error occurs when Elasticsearch cannot interpret the SAML (Security Assertion Markup Language) message it received. This could be due to incorrect formatting, missing information, or a mismatch between the SAML message and the Elasticsearch configuration. To resolve this issue, you can: 1) Verify the SAML message for any formatting errors or missing information. 2) Check the Elasticsearch configuration to ensure it matches the SAML message. 3) Ensure that the SAML message is being sent correctly from the identity provider. 4) Update or reinstall Elasticsearch if it’s not processing SAML messages correctly.

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

Log Context

Log “Failed to parse SAML message” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 root = doc.getDocumentElement();
 if (logger.isTraceEnabled()) {
 logger.trace("Received SAML Message: {} \n"; samlFactory.toString(root; true));
 } catch (SAXException | IOException e) {
 throw new ElasticsearchSecurityException("Failed to parse SAML message"; RestStatus.BAD_REQUEST; e);
 return root;
 }  private byte[] decodeBase64(String content) {


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