Try redownloading Warlander or restarting your ONU or router.
If the problem persists, please try the following:
・Check to see if Warlander has permission to go through your firewall.
・Check your network settings and make sure that NAT is properly configured and that network communication is possible.
・Turn off your VPN
・Disable IPv6 (Control Panel > Network and Internet > Network and Sharing Center > Open your network connection device > Properties > Uncheck IPv6)
・Open UDP ports 1024 to 54435 or 1024 to 65535 if you're unable to specify a range. Check the article below for more detailed instructions.