Zend certified PHP/Magento developer

Can’t open 8888 from VM host to linux guest

I started a jupyter notebook service on a linux guest, there is no problem for me to access it from a browser within the guest with the address like localhost:8888

When I tried to access it from my host, it doesn’t open for me.

I checked the ping/telnet, it shows ping is fine but telnet to the port fails to connect.

I also temporally close firewall on my host, no change.

How do I troubleshoot issue like this?