I try in Win7 by means of PGAdmin 3 to be connected to a host 192.168.1.8 with the virtual machine with linux. Already which time I receive the message
Server doesn't listen The server doesn't accept connections: the connection library reports could not connect to server: Connection timed out (0x0000274C/10060) Is the server running on host "192.168.1.8" and accepting TCP/IP connections on port 5432? If you encounter this message, please check if the server you're trying to contact is actually running PostgreSQL on the given port. Test if you have network connectivity from your client to the server host using ping or equivalent tools. Is your network / VPN / SSH tunnel / firewall configured correctly? For security reasons, PostgreSQL does not listen on all available IP addresses on the server machine initially. In order to access the server over the network, you need to enable listening on the address first. For PostgreSQL servers starting with version 8.0, this is controlled using the "listen_addresses" parameter in the postgresql.conf file. Here, you can enter a list of IP addresses the server should listen on, or simply use '*' to listen on all available IP addresses. For earlier servers (Version 7.3 or 7.4), you'll need to set the "tcpip_socket" parameter to 'true'. You can use the postgresql.conf editor that is built into pgAdmin III to edit the postgresql.conf configuration file. After changing this file, you need to restart the server process to make the setting effective. If you double-checked your configuration but still get this error message, it's still unlikely that you encounter a fatal PostgreSQL misbehaviour. You probably have some low level network connectivity problems (e.g. firewall configuration). Please check this thoroughly before reporting a bug to the PostgreSQL community.
Help to be connected to a host. (I certainly googled and as understood it is necessary to make changes to some files on the virtual machine, specify specifically what and what to add and change, English I know not so well).