I have an identical issue on Ubuntu 18 running lxd containers. And oddly enough the apparrent redirection persists even after running “ufw disable” to disable the firewall,
Here is the tcpdump. If I, from the container try to telnet to bbc port 443
IP 10.223.8.144.47004 > 10.223.8.144.https: Flags [S],
This is the ip address of the container
If I change the target port to 444 I get the expected result
IP 10.223.8.144.37332 > 151.101.128.81.snpp: Flags [S],
which is sending to the bbc ip address
Maybe my incoming redirect rules are not configured properly, something I should look at.
George