https available although no service is listening on 443 ?

Summary

https available although no service is listening on 443 ?

Content

I just created a cloud database service. When SSH into its VM, I find that the ORDS service is running and I can access the default page via https from another system ( after bypassing the warning of invalid certificates ) . I notice that netstat does not show any service that is listening on the port 443 on this VM. I check again with telnet localhost 443 and I do get a connection refused message.

 

When I run tcpdump on the port 443 and access it again from another system, it does show tcp transactions from the remote host into the VM on this port.