HMAC Key parse failed for setting jwkSetConfigKey – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.2-8.9

Briefly, this error occurs when Elasticsearch fails to parse the HMAC key for a specific setting, indicated by the variable “jwkSetConfigKey”. This could be due to an incorrect or malformed key. To resolve this issue, you can verify the HMAC key’s format and correctness. If the key is being fetched from an external source, ensure the source is reliable and accessible. If the key is stored in a file, check the file’s permissions and integrity. Lastly, ensure the key is correctly configured in your Elasticsearch settings.

This guide will help you check for common problems that cause the log ” HMAC Key parse failed for setting [” + jwkSetConfigKey + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “HMAC Key parse failed for setting [” + jwkSetConfigKey + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 static OctetSequenceKey loadHmacJwkFromJwkString(final String jwkSetConfigKey; final CharSequence hmacKeyContents) {
 if (Strings.hasText(hmacKeyContents)) {
 try {
 return buildHmacKeyFromString(hmacKeyContents);
 } catch (Exception e) {
 throw new SettingsException("HMAC Key parse failed for setting [" + jwkSetConfigKey + "]"; e);
 return null;


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