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Code42 Support

TCP packet QoS settings not applied to the CrashPlan app

Applies to:
  • CrashPlan for Small Business (Mac only)
  • CrashPlan PROe


This article describes the solution for a known issue in which the CrashPlan app does not apply the TCP packet QoS priority settings.


Code42 environments that both:

  • Use IPv4 (or a mix of IPv4 and IPv6)
  • Use CrashPlan app version 4.7.0 or later


  • This solution is only available for devices using CrashPlan app version 4.7.0 and later.
  • You must repeat these steps each time you upgrade the CrashPlan app. These changes are reverted during the upgrade process.

Before you begin

For customers with an on-premises authority server, you must upgrade your Code42 environment to Code42 server version 5.3.0 and CrashPlan app 4.7.0 or later.

Recommended solution

To enforce the TCP Packet QoS setting:

  1. On the device where the CrashPlan app is installed, navigate to the CrashPlan app configuration file:
    • Windows
      • Installed for everyone: C:\Program Files\CrashPlan\CrashPlanService.ini
      • Installed per user: C:\Users\<username>\AppData\<Local|Roaming>\Programs\CrashPlan\CrashPlanService.ini
    • OS X
      • Installed for everyone: /Library/LaunchDaemons/com.crashplan.engine.plist
      • Installed per user: ~/Library/LaunchAgents/com.crashplan.engine.plist
    • Linux: /usr/local/crashplan/bin/run.conf
  2. Open the file in a text editor.
  3. Add this line to the configuration file:
  4. Save your changes.
  5. Restart the device.