Send message failed channel – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to send a message through a specific channel, possibly due to network issues, firewall restrictions, or the recipient node being unavailable. To resolve this, you can check the network connectivity between nodes, ensure that there are no firewall rules blocking communication, and verify that the recipient node is up and running. Additionally, check the OpenSearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” send message failed [channel: {}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “send message failed [channel: {}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        protected void innerOnFailure(Exception e) {
            if (NetworkExceptionHelper.isCloseConnectionException(e)) {
                logger.debug(() -> new ParameterizedMessage("send message failed [channel: {}]"; channel); e);
            } else {
                logger.warn(() -> new ParameterizedMessage("send message failed [channel: {}]"; channel); e);
            closeAndCallback(() -> listener.onFailure(e));

        private void closeAndCallback(Runnable runnable) {


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