Why I cannot connect successfully via my synology docker hbbs/hbbr?

I use the synology docker version. I try to connect from win10 at home to remote linux (ubuntu 20.04) at office. Both sides use the latest rustdesk 1.1.9. When I use the default server, I can connect. But using my self-server , I cannot connect. The IP of synology at home is 192.168.0.110, and win10 is 192.168.0.109 I have a public network IP, say A.B.C.D which can connect to home via it. I made nat to synology (192.168.0.110) for ports 21115, 21116, and 21117 I set the "ID server" at win10 rustdesk as 192.168.0.110 I set the "ID server" at remote linux rustdesk as A.B.C.D The docker command for hbbs is: hbbs -r 192.168.0.110 The docker command for hbbr is just: hbbr Both win10 and linux sides should have reached the server because the logs of hbbs and hbbr have the following clues

However, when I connect from win10 to linux, it fails.