Http client did not trust this servers certificate; closing connection – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

Briefly, this error occurs when the HTTP client does not trust the server’s certificate, which can cause issues with communication between the client and the server. To resolve this issue, you can try to configure the client to trust the server’s certificate, or check the certificate configuration for errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them. Take a self-guided product tour to see for yourself (no registration required).

This guide will help you check for common problems that cause the log ” Http client did not trust this servers certificate; closing connection ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: client and plugin.

Log Context

Log “Http client did not trust this server’s certificate; closing connection {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         } else if (isReceivedCertificateUnknownException(cause)) {
            if (logger.isTraceEnabled()) {
                logger.trace(new ParameterizedMessage("http client did not trust server's certificate; closing connection {}";
                      ; cause);
            } else {
                logger.warn("http client did not trust this server's certificate; closing connection {}";;
        } else {
            super.exceptionCaught(ctx; cause);


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