Can’t connect to a null node – Elasticsearch Error How To Solve Related Issues

Can’t connect to a null node – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many errors 


This guide will help you check for common problems that cause the log “can’t connect to a null node” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: node.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

Log Context

Log”can’t connect to a null node”classname  is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

public void connectToNode(DiscoveryNode node; ConnectionProfile connectionProfile;
  ConnectionValidator connectionValidator;
  ActionListener listener) throws ConnectTransportException {
  ConnectionProfile resolvedProfile = ConnectionProfile.resolveConnectionProfile(connectionProfile; defaultProfile);
  if (node == null) {
  listener.onFailure(new ConnectTransportException(null; "can't connect to a null node"));
  if (connectingRefCounter.tryIncRef() == false) {
  listener.onFailure(new IllegalStateException("connection manager is closed"));

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Can't connect to ElasticSearch server using Java API -views 44,940 ,score 21

Can‚Äôt add node to a single node cluster in elasticsearch [ master_not_discovered_exception ] -views   758

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