If you are having difficulty establishing a connection between two computers for Flow, follow these steps:

1. Check both systems are connected to the internet:
   • On each computer, open a web browser and check the internet connection by navigating to a webpage.
2. Check that both computers are connected to the same network: 
   • Open the Terminal: For Mac, open your Applications folder, then open the Utilities folder. Open the Terminal application.
   • In the Terminal, type: Ifconfig
   • Check and note the IP address and Subnet mask. Make sure that both systems are in the same Subnet.
3. Ping the systems by IP address and make sure that ping works:
   • Open the Terminal and type ping <IP address>  [Where the <IP address is the IP address of the other computer noted in Step 2 above]
4. Check that the Firewall and Ports are correct:

   Ports used for Flow:

   TCP	59866
   UDP	59867,59868

   1. Open the Terminal and type the following cmd to show the ports in use:
      > sudo lsof +c15|grep IPv4
   2. This is the expected result when Flow is using the default ports:

      

      NOTE: Normally Flow uses the default ports but if those ports are already in use by another application Flow might use other ports.
   3. Check that the Logitech Options Daemon is added automatically when Flow is enabled:
      • Go to System Preferences > Security & Privacy
      • In Security & Privacy go to the Firewall tab. Make sure the Firewall is on, then click on Firewall Options. (NOTE: You may have to click the lock in the bottom left corner to make changes which will prompt you to enter the account password.)
      NOTE: On macOS, the firewall default settings automatically allow ports opened by signed apps through the firewall.  As Logi Options is signed it should be added automatically without prompting the user.
   4. This is the expected result: The two "Automatically allow" options are checked by default. The "Logitech Options Daemon" in the list box is added automatically when Flow is enabled.

      

   5. If Logitech Options Daemon is not there, try the following:
      • Uninstall Logitech Options
      • Reboot your Mac
      • Install Logitech Options again
   6. Disable Antivirus and reinstall:
      • Try disabling your Antivirus program first, then reinstall Logitech Options.
      • Once Flow is working, re-enable your Antivirus program.

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