Unexpected exception while closing http channels – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an unexpected issue while trying to close HTTP channels. This could be due to network issues, resource constraints, or a bug in the software. To resolve this, you can try restarting the OpenSearch service to clear any temporary issues. If the problem persists, check the system resources and network connectivity. If everything seems fine, consider updating OpenSearch to the latest version as it might be a software bug that has been fixed in a newer version.

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This guide will help you check for common problems that cause the log ” unexpected exception while closing http channels ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “unexpected exception while closing http channels” classname is AbstractHttpServerTransport.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :


        try {
            CloseableChannel.closeChannels(new ArrayList(httpChannels); true);
        } catch (Exception e) {
            logger.warn("unexpected exception while closing http channels"; e);



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