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Code42 Support

Known conflicts with the Code42 app

Available in:

Small Business
Applies to:


Antivirus and security software is designed to protect your system against unknown applications and unauthorized Internet activity. If your antivirus or security software doesn’t recognize the Code42 app as an approved application, you may not be able to back up. There are several messages you might experience when there is a conflict:

  • “Cannot connect to the background service.”
  • “Cannot connect to destination. If the problem continues, contact your administrator or support for assistance.”

This troubleshooting article recommends solutions for resolving conflicts between the Code42 app and anti-virus and security software.

Antivirus and security software known conflicts

The following antivirus and security applications have been known to prevent Code42 app connections:

  • Avast
  • AVG
  • Avira
  • McAfee
  • Intego VirusBarrier
  • Intego NetBarrier
  • One Periodic Hands Off!
  • BeyondTrust PowerBroker (version 6.5)
  • Little Snitch

Recommended solution

Add an exception to antivirus and security applications

If you are using one of the applications listed above, consult the manufacturer's documentation on how to add an exception for a blocked application, then add an exception for the Code42 app that allows for incoming and outgoing communication. See External Resources below for links to instructions for commonly used applications.

Port requirements
The Code42 app requires certain ports in order to function. The Code42 app may not need to use these ports all the time, but it still needs to prepare them for use (open the socket). Some firewall software may require you to enter specific ports when adding an exception. By default, the Code42 app reserves ports 4242, 4243, and 4244, but a different port may be assigned if these ports are already in use. See our steps for identifying the ports used by the Code42 app on your device.

Upgrading the Code42 app to a new version may cause antivirus or security software to see that version as a new application and block its activity. If this occurs, re-add the Code42 app as an approved application in your antivirus or security software.

Temporarily uninstall application

If you are using an antivirus or security application not included in the list above, you can determine if it is conflicting with the Code42 app by temporarily disabling or removing the application. Once you diagnose the application causing the conflict, consult the manufacturer's documentation on how to add an exception.