Can anyone explain below ? Happened just after a unregistration.. below
error during registration...

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\>zac reg https://server1

Processing Command: reg

user name: administrator
password: **************

Unable to register with the server at: https://server1.
Service Error. code: -21, message: Could not determine device type
from <OS>
tag: unsupported


The error does not make sense as the OS is supported - Win XP.
Everything was working fine before I decided to change the zone.

I have tried to uninstall and reinstall the agent.