Failed to decrypt SAML attribute – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch cannot decrypt the SAML (Security Assertion Markup Language) attribute, which is used for single sign-on (SSO) services. This could be due to incorrect or mismatched encryption keys. To resolve this issue, you can check and ensure that the encryption keys match on both the Identity Provider (IdP) and Service Provider (SP). Also, ensure that the correct encryption algorithm is being used. If the problem persists, you may need to regenerate and reconfigure the encryption keys.

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This guide will help you check for common problems that cause the log ” Failed to decrypt SAML attribute ” 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 decrypt SAML attribute ” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            return null;
        try {
            return decrypter.decrypt(encrypted);
        } catch (DecryptionException e) {
  "Failed to decrypt SAML attribute " + text(encrypted; 32); e);
            return null;

    private void checkConditions(Conditions conditions) {


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