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CrashPlan Support

CrashPlan App Ports And Network Communication

Applies to:
  • CrashPlan for Home


This article shows the TCP network ports that the CrashPlan app uses to communicate with CrashPlan Central and with your other CrashPlan devices.

Ports used by the CrashPlan app

The CrashPlan app requires the following ports to communicate with your backup destinations. Depending on the destinations you use, you may not require all ports:

Port(s) Protocol Destination Description
4242* TCP CrashPlan device (Default) Listening port required for computer-to-computer connections
Port can be changed from Settings > General > Inbound backup from other computers
4243* TCP localhost (Default) Used by the CrashPlan app to connect to the CrashPlan service
443 TCP Code42 cloud (Required) Used by the CrashPlan app to connect to the Code42 cloud

1,024 - 14500,

49,000 - 52,000

TCP CrashPlan device

(Optional) NAT traversal ranges used for connecting between computers





CrashPlan device (Optional) Standard UPnP ports required for computer-to-computer connections
5351 UDP CrashPlan device (Optional) Standard NAT-PMP port required for computer-to-computer connections

* Depending on your configuration, alternative ports may be used. To find the ports used on your computer, identify the ports used by the CrashPlan app.

Computer-to-computer communications

The CrashPlan app communicates between multiple computers on one CrashPlan account. If you back up to a friend's computer, your CrashPlan app also communicates with computers on your friend's CrashPlan account. Even if you only back up to CrashPlan Central, your computers communicate to share account settings and reporting information.

The CrashPlan app automatically handles computer-to-computer communications using several types of networking protocols:

If you disable these networking protocols on your computers, you must manually configure port forwarding to allow computer-to-computer backup.