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on your dns server add an A record for you www.xyz.com and point it to the internal ip address of that webserver
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on your dns server add an A record for you www.xyz.com and point it to the internal ip address of that webserver

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I have a Windows 2003 network behind a firewall. &nbsp;My website is hosted by my ISP. &nbsp;I have a CNAME record with my ISP that resolves http://xyz.com&nbsp;to http://www.xyz.com. &nbsp;However, I cannot do this internally on my network. &nbsp;There, http://www.xyz.com&nbsp;points to my external website; however, http://xyz.com&nbsp;does not resolve and nslookup tells me that it is resolving to my DNS server. &nbsp;How can I fix this and will it break my internal DNS capability?
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I have a Windows 2003 network behind a firewall.  My website is hosted by my ISP.  I have a CNAME record with my ISP that resolves http://xyz.com to http://www.xyz.com.  However, I cannot do this internally on my network.  There, http://www.xyz.com points to my external website; however, http://xyz.com does not resolve and nslookup tells me that it is resolving to my DNS server.  How can I fix this and will it break my internal DNS capability?

Windows 2003 DNS does not resolve partial domain name internally

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

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).