Accessing webservice in docker image from a macchine different from docker host - docker

Question

Good morning,
I'm a new user of docker technology and I'm facing some issue.
Any help will be appreciated (I update the question, thanks to the questions provided by #JRichardsz).
Here the problem:
Docker Host: Ubuntu 20.04.2 LTS. This is a VMWare virtual machine
In the host no process is using port 80. (Running "sudo lsof -i :80" return no process name, if I do not start any docker image)
if I stop the running docker image by "docker compose down", I have 2 network interfaces:
docker0: flags=4099 mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:2f:a6:ae:d2 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens160: flags=4163 mtu 1500
inet 192.168.128.60 netmask 255.255.255.0 broadcast 192.168.128.255
inet6 fe80::250:56ff:fea6:60bb prefixlen 64 scopeid 0x20
ether 00:50:56:a6:60:bb txqueuelen 1000 (Ethernet)
RX packets 2929 bytes 251888 (251.8 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 424 bytes 53706 (53.7 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
when I start my docker image (this is a docker image provided by Xibo CMS developers), the network interfaces related to the docker image appears, and I'm able to view bridge information:
bridge name bridge id STP enabled interfaces
br-33e8e1916c0d 8000.024261f9ddaa no veth0b9040e
veth3c6ecf0
veth821b253
vethe879c11
docker0 8000.02422fa6aed2 no
when the docker is active, command "sudo lsof -i :80" provides me:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
docker-pr 25417 root 4u IPv4 122292 0t0 TCP *:http (LISTEN)
docker-pr 25423 root 4u IPv6 122300 0t0 TCP *:http (LISTEN)
so web service inside docker image is active on all interfaces.
If I open a browser inside the Linux docker Host, looking at url http://127.0.0.1/ I can access the web server page without any problem
If I open a browser at http://192.168.128.80/ in a PC connected in the same subnet of ens160, I'm not able to reach the webserver.
Please note, no firewall is active (if I shutdown docker image by "docker compose down" command, and try from a PC connected in the same subnet of ens160 to open a telnet connection to port 80 in 192.168.128.80, I can capture packets using tcpdump)
After stopping the docker image, I performed the following commands on the docker host PC:
sudo python3 -m http.server 80
connecting from a different PC using putty telnet on port 80, I can see messages on the python example command line (so no firewall issues)
Is there anyone that can help me find why the webservice inside docker image can be accessed only when opening webpage from Linux Docker Host machine?
Any help will be very helpful.