Index queue won't flush automatically, 'Caused by: java.net.SocketException: Unrecognized Windows Sockets error: 0: recv failed' errors thrown

Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.

Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.

*Except Fisheye and Crucible

Summary

Problem

Unable to clear indexing queue automatically, items sit in the queue even after:

  • The following appears in the atlassian-confluence.log

1 Caused by: java.net.SocketException: Unrecognized Windows Sockets error: 0: recv failed

You may also see this error:

1 2 ERROR [scheduler_Worker-6] [org.quartz.core.ErrorLogger] schedulerError Unable to notify JobListener(s) of Job to be executed: (Job will NOT be executed!). trigger= DEFAULT.IndexQueueFlusher job= DEFAULT.IndexQueueFlusher org.quartz.SchedulerException: JobListener 'ScheduledJobListener' threw exception: Could not open Hibernate Session for transaction; nested exception is net.sf.hibernate.exception.JDBCConnectionException: Cannot open connection [See nested exception: org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is net.sf.hibernate.exception.JDBCConnectionException: Cannot open connection]

Diagnosis

Environment

  • Windows

  • Server has both IPv4 and IPv6 enabled

Cause

The Java Virtual Machine (JVM) can have problems opening or closing sockets at the operating system level when both IPv4 and IPv6 are enabled on a Windows server.

Solution

Workaround

  1. JVM will need to run over IPv4, if possible. To do this add this set the following JVM option:

    1. Shutdown Confluence

    2. Open <confluence-install-directory>/bin/setenv.bat

      1. For Confluence 5.6 and later

        1. Add the following below CATALINA_OPTS section

          1 set CATALINA_OPTS=-Djava.net.preferIPv4Stack=true %CATALINA_OPTS%

        2. Save the file

      2. Confluence 5.5 and below

        1. Add the following below the JAVA_OPTS section

          1 set JAVA_OPTS=-Djava.net.preferIPv4Stack=true %JAVA_OPTS%

        2. Save the file

    3. Start Confluence

  2. You may also need to adjust the prefix policy to prefer IPv4 over IPv6

    1. If you are unfamiliar with the process you can refer to Microsoft's Fix-its.

      ⚠️ These Fix-its are provided by Microsoft and are not supported by Atlassian.

Updated on April 8, 2025
Platform
Data Center only
Product
Confluence Data Center
On this pageSummaryDiagnosisCauseSolution

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