Logitech MX Master Frequently Asked Questions Manual page 18

drivers and startup programs. You can then determine whether a background program is
interfering with the program. Please see the Microsoft instructions on performing a clean boot
here.
 +Flow network setup check for Mac
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:
o 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:
o Open the Terminal: For Mac, open your Applications folder, then open the Utilities
folder. Open the Terminal application.
o In the Terminal, type: Ifconfig
o 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:
o 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