Hi Haydn,

Thanks for the suggestions and for your time. I've visited that website and tried solution #1 (because solution #2 does not apply - there's no firewall on the gateway and the windows firewall is turned off). Indeed, the link given in that solution did not work, and so they say that it means that a firewall is preventing the connection...

Well, I beg to differ, since there's no firewall on the gateway (as stated above). Besides that, there's a simple and logic fact: if I change from the virtio driver to the rtl8139 (or e1000) driver, everything works fine ! How could be a firewall problem if it works only changing the interface model ?

So, people reading all these posts I sent, might wonder: "What the heck man, it's just Windows Update not working - LET IT GO !!!" But I must say: now, there's no proof that this is only a "Windows Update not working" problem. What if some people out there are having problems with their KVM guests with PV drivers "misteriously" not accessing their Oracle or SQL Server databases ? What if their email servers "misteriously" drop some connections ? They all should avoid using PV drivers for the sake of stability ?

Don't get me wrong - I'm not complaining to YOU; I'm just bringing this strange behavior to light, so that people with more experience than me can research and find out what is wrong (and so do I).

Once again, thanks for your time and patience !

Regards,
Roberto