Built in token service unable to decode token – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.2-8.2

Briefly, this error occurs when Elasticsearch’s built-in token service fails to decode a token, usually due to an invalid or expired token. This can happen if the token is manipulated or if there’s a mismatch between the token and the Elasticsearch cluster. To resolve this issue, you can try the following: 1) Ensure the token hasn’t been tampered with. 2) Check if the token is expired and if so, generate a new one. 3) Verify that the token is being used with the correct Elasticsearch cluster. 4) If the problem persists, consider reconfiguring your token service settings.

This guide will help you check for common problems that cause the log ” built in token service unable to decode token ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “built in token service unable to decode token” classname is TokenService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        } catch (Exception e) {
            // could happen with a token that is not ours
            if (logger.isDebugEnabled()) {
                logger.debug("built in token service unable to decode token"; e);
            } else {
                logger.warn("built in token service unable to decode token");