si ho provato anche a modificare il file host in c:\windows\system32 niente da fare.
stavo controllando se era un problema di ipv6 : http://www.vmware.com/files/pdf/techpaper/vsp_50_vcserver_cmdline_install.pdf
"Fully qualified domain name
of Directory Services for the
vCenter Server group
FQDN Required.
If the instance of vCenter Server is standalone, the default is the
machine’s FQDN.
If this instance of vCenter Server is joining a group, this is the name of
a remote instance of vCenter Server. The local and remote instances
will be members of a Linked Mode group.
In some cases, you can enter the IP address instead of the FQDN.
To help ensure connectivity, the best practice is to use the FQDN.
For IPv6, unless both the local and the remote machines are in IPv6
mode, you must enter the FQDN of the remote machine instead of the
IPv6 address.
If the local machine has an IPv4 address and the remote machine has
an IPv6 address, the local machine must support IPv4 and IPv6 mixed
mode. The domain name server must be able to resolve both IPv4 and
IPv6 addresses if your environment has both addressing types in a
single Linked Mode group."
potrebbe essere qui il problema?