Scan do not resolve host names

Install of Greenbone OS 4.2.24 is OK
Feeds are up to date
When I scan domaine names, it goes very quickly (12 seconds for 30 sites). If I scan the internal network (, the same happens.
If I use a shell, there is no problem to ping but I cannot ping any other site. On the same subnet I can nmap any domaine or any range of IP’s (it does not look as a network configuration issue).