Why is the VM not seen by a physical machine on the same LAN even though it is connected in bridge mode?

Only the host where the machine is installed can ping or see the VM on the network, returning results from the arp or telnet. But what I want is for another host to see this VM. The ultimate goal is to make this host connect, through the x2go client, to the VM with x2go server; but neither ping works, nor arp, nor telnet. An important detail is that the VM sees this host, but not the other way around. There is no firewall enabled either on the VM, nor I your host, nor on the other host.