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Can't find an answer?

Ping is not working

First, make sure your device is authorized on the network and you're using the ZeroTier assigned Managed IP address. Aside from that, some OSes block pings in their local firewall by default.

Windows Firewall

ZeroTier versions 1.10.3 and greater automatically enable ping on ZeroTier adapters.

macOS Firewall

The firewall is not enabled by default on macOS, and thus pings will not be blocked by default. If your firewall is enabled on macOS, go into System Preferences -> Security & Privacy. Under Firewall Options, ensure "Enable stealth mode" is disabled. Stealth mode blocks pings.

Linux Firewalls

There are far too many Linux distributions out there to list instructions for all of them here. Please refer to your distribution's documentation for how to unblock ICMP packets.

Get Started

Click here to create your network and start adding devices.

Error: Cannot connect to ZeroTier service (or Node ID "Unknown" in the GUI apps)

This error means that the ZeroTier background service on your computer is either not running, or your local firewall is preventing the UI or CLI from talking to it.

Windows Service

Open Task Manager and go to the "Services" tab. Scroll down until you see "ZeroTierOneService". The status column should say "Running". If it does not, right click on the line and click "Start"

macOS Service

Open and execute the following commands

sudo launchctl unload /Library/LaunchDaemons/
sudo launchctl load /Library/LaunchDaemons/

Linux Service

If your Linux distribution uses systemd, execute:

sudo service zerotier-one start

If not, execute:

/etc/init.d/zerotier-one start

Still doesn't work?

Your system firewall is likely blocking communication with the ZeroTier service. Look up instructions for how to unblock an application from the firewall for your OS. ZeroTier will need to be accessible via TCP port 9993 for the UI and CLI to interact with it.

Emergency Instructions

"It was working, but now it's not and I'm not sure why. And I need to get up and running quick."

First, check with your friendly firewall admin that no configuration in the physical network connection has changed.

See the CLI article for help with the CLI.

We're not aware of any bugs that require these steps, or we'd fix them, but sometimes people try the below.

Listed in order of severity:

Restart the service

Open, paste the below, and press enter:

sudo launchctl unload /Library/LaunchDaemons/
sudo launchctl load /Library/LaunchDaemons/

It will ask you for your password. It's the password you use to log in to your mac.

Leave all networks and rejoin them

Use the UI, or

zerotier-cli leave <network-id> and zerotier-cli join <network-id>

Stop service, Delete peers.d, Start service

Find peers.d in the zerotier system directory

Reset Node ID

The new node ID will have be re-authorized on any networks, and the node's managed IP address manually re-assigned if needed.

  • Stop the service

  • Move or delete identity.secret and identity.public files in the zerotier system directory

  • Delete peers.d too

  • Start the service