Solution 1: Try to remove local config and restart synergy
⚠️ Warning: serial-key lisence will be asked again.
*Prepare your liscence key before run those commands.
# Open Terminal # Run commnad bellow and restart synergy rm ~/Library/Preferences/com.http-symless-com.Synergy.plist rm -rf ~/Library/Synergy/ killall -u $USER cfprefsd
Solution 2: (MacOS Catalina / Mojave)
Goto System Preferences > Security & Privacy > Accessibility Then Remove synergy And Add synergy again And Reopen synergy
Problem : Wifi network Solution Try Turn Wi-fi off and on Then Try synergy again