I've tried to disable WinXP firewall and reboot, but Nod32 still can't connect to the server.
Then I installed Sygate Personal Firewall because years ago I had no problem with Nod32 version 6 and Sygate, but the error remains. I've also changed different settings in "Internet options" checking and unchecking SSL TLS etc. but it's still not working.
Windows XP network troubleshooting give the message " Windows can't connect to the internet using HTTP, HTTPS, or FTP. This is probably caused by firewall settings on this computer.
Check the firewall settings for the HTTP port 80,HTTPS port 443 and FTP port 21."
Firefox can access the internet while Internet Explorer has some problems... several Eset website pages are not accessible with IE, other give warnings about security certificate... but everything works fine with Firefox (see attached image, same link with different results)