With Windows it could be that you have to set the licensserver in License Admin to either localserver or some remotemachine. Don't set the licenseserver to be “hserver” . Or it could be the firewall, or even the host file under /SYSTEM/drivers/etc.
It's weird. I'm using both H8 and H9 - when I install H8, it works fine, but then when I install H9 as well, I get the licensing error. I've never had this problem before.
stu 2. Install H8, but without the re-installing the license server.
so the problem must have been that it was the version 8.2 of the license server that was running instead of version 9.0. The license server v8.2 is not capable of serving 9.0 licenses, so Houdini 9 would not run.