@Ivan_Yacapin, please ensure L2TP/IPsec is disabled in Balance 210. Then, you need to port forward the ports for L2TP/IPSec to your L2TP/IPSec server. Ensure Inbound firewall allows those required ports.
As mentioned here, you may do the Network Capture to confirm where the L2TP/IPSec packet dropped if you still face the problem on L2TP/IPSec connection. You may get help from your purchasing point or local Peplink partner if you need further help. They can provide the better coverage.