Hi viethoc,
Before investigating further, can you please check the firewall on your mac machines and make sure you use the correct IP addresses ?
If it doesn’t help, please send us more details, including client and server logs, via e-mail to forum[at]nomachine[dot]com, referencing the topic in the subject field.
Logs can be gathered following this procedure: https://www.nomachine.com/DT10O00163