Failed to close a socket – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.4-8.9

Briefly, this error occurs when Elasticsearch is unable to close a network socket, possibly due to a network issue or a system resource limitation. To resolve this issue, you can try the following: 1) Check your network connection and ensure it’s stable. 2) Review your system resources, particularly file descriptors and sockets, and increase their limits if necessary. 3) Ensure that Elasticsearch has the necessary permissions to close sockets. 4) Restart Elasticsearch to clear any temporary issues.

This guide will help you check for common problems that cause the log ” Failed to close a socket. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “Failed to close a socket.” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            logger.warn("Failed to create a new channel from an accepted socket."; t);

            try {
            } catch (Throwable t2) {
                logger.warn("Failed to close a socket."; t2);

        return 0;


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