Thank you jaclaz. I checked and saw firewall filters after your informations. There is the config which drop all connections incoming from WAN interface. ;;; defconf: drop all from WAN not DSTNATed chain=forward action=drop connection-state=new connection-nat-state=!dstnat in-interface-list=WAN log=...

Hi, I have small business. You can see the basic topology at below. ISP put the these mikrotik to connect two site each other. https://i.hizliresim.com/ikd23pp.png I can access to FWA from FWB but can't access to FWB from FWA. I'm sharing each route table, pings and traceroutes at below. Everything ...