External IP Static (Public) cannot access to IP Private via NAT

Hi, everyone.
I cannot access my server via External IP with flag Cd and SCFd in firewall connection.
Please see attachment.
Do you any advice?
error Cd SFCd.PNG

Yes, config your device properly.

could you be more specific, please ?

Port forwarding??

https://forum.mikrotik.com/viewtopic.php?t=179343

Thanks for your responses,
I don’t have any port forwarding.
here is telnet’s capture from 36.88.xx.xx (from external)
and this case is only for single ISP (Internet Service Provider).
If I trace the route from another ISP, there is no problem.
traceroute from external.PNG