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I'm seeing this as well however the cause is easy to find: the DNS server is not Windows.<br />
In short, the main DNS server is BIND 9 with all the windows stuff (_.msdsc, _tcp, DomainDnsZones, etc) has been handed off to the 2003 server (DC).<br />
I have deliberately turned off dynamic updates as I don't want Windows machines corrupting my zone files. <br />
How do I turn off dynamic updates on a XP box??<br />
Current solution is to ignore the errors since everything else is working.
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I'm seeing this as well however the cause is easy to find: the DNS server is not Windows.
In short, the main DNS server is BIND 9 with all the windows stuff (_.msdsc, _tcp, DomainDnsZones, etc) has been handed off to the 2003 server (DC).
I have deliberately turned off dynamic updates as I don't want Windows machines corrupting my zone files. 
How do I turn off dynamic updates on a XP box??
Current solution is to ignore the errors since everything else is working.

The Security System could not establish a secured connection with the server.......

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).