Failed to validate incoming join request from node – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when a node tries to join an Elasticsearch cluster but fails the validation process. This could be due to version mismatch, different cluster names, or network issues. To resolve this, ensure all nodes have the same Elasticsearch version and cluster name. Check your network settings and firewall rules to ensure nodes can communicate. Also, verify the node’s configuration files for any discrepancies.

To understand why Elasticsearch failed to validate incoming join requests from certain nodes, and what impact this will have on your system, you should run the Elasticsearch Error Check-Up. It’ll give you a better grasp of what is happening in your system and assist you in resolving issues.

This guide will help you check for common problems that cause the log “Failed to validate incoming join request from node” to appear. It’s important to understand the issues related to it, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: discovery, join, node and request.

Log Context

Log “failed to validate incoming join request from node [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            new ValidateJoinRequest(clusterState);
            TransportRequestOptions.of(null; TransportRequestOptions.Type.STATE);
            new ActionListenerResponseHandler(listener.delegateResponse((l; e) -> {
                logger.warn(() -> new ParameterizedMessage("failed to validate incoming join request from node [{}]"; discoveryNode); e);
                    new IllegalStateException(
                            "failure when sending a join validation request from [%s] to [%s]";


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