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

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

  public void openConnection(DiscoveryNode node; ConnectionProfile profile; ActionListener listener) {
  Objects.requireNonNull(profile; "connection profile cannot be null");
  if (node == null) {
  throw new ConnectTransportException(null; "can't open connection to a null node");
  ConnectionProfile finalProfile = maybeOverrideConnectionProfile(profile);
  closeLock.readLock().lock(); // ensure we don't open connections while we are closing
  try {


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 Elasticsearch: Failed to connect to localhost port 9200 – Connection refused -views 189,753 ,score 106

Java ElasticSearch None of the configured nodes are available -views   142,496,score 58



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