Failed to connect to remote clusters – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch is unable to establish a connection with remote clusters. This could be due to network issues, incorrect configuration of the remote clusters, or firewall restrictions. To resolve this issue, you can check the network connectivity, verify the configuration settings of the remote clusters, and ensure that the firewall rules allow connections between the clusters. Additionally, check the Elasticsearch logs for more detailed error messages that can help identify the root cause of the problem.

This guide will help you check for common problems that cause the log ” failed to connect to remote clusters ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “failed to connect to remote clusters” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        } catch (InterruptedException e) {
        } catch (TimeoutException ex) {
            logger.warn("failed to connect to remote clusters within {}"; timeValue.toString());
        } catch (Exception e) {
            logger.warn("failed to connect to remote clusters"; e);

    public void close() throws IOException {


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