Connection validation was skipped – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.9

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Briefly, this error occurs when the system is unable to validate the connection to the OpenSearch server. This could be due to network issues, incorrect configuration settings, or the server being down. To resolve this, you can check the network connection, ensure the server is running, and verify the configuration settings. If the issue persists, consider restarting the OpenSearch service or checking the server logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” Connection validation was skipped ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “Connection validation was skipped” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    public ConnectionManager.ConnectionValidator extensionConnectionValidator(DiscoveryNode node) {
        return (newConnection; actualProfile; listener) -> {
            // We don't validate cluster names to allow for CCS connections.
            handshake(newConnection; actualProfile.getHandshakeTimeout().millis(); cn -> true;; resp -> {
                final DiscoveryNode remote = resp.discoveryNode;
      "Connection validation was skipped");
                return null;


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