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Preventing Naming Conflicts During a Domain Upgrade

Jul. 29, 2003 Bob Chronister | Windows IT Pro

We're getting ready to upgrade our Windows NT domain, which contains two NT 4.0 domain controllers (DCs), to Windows 2000, and we're going to implement Active Directory (AD). We use a mix of Windows clients running everything from Windows XP to Windows 98 Second Edition (Win98SE). The name of our NT domain includes an underscore (_). Will this character cause any problems when we upgrade?

No. You can configure the Win2K DNS server to allow or disallow the use of UTF-8 characters, such as the underscore. Open the Microsoft Management Console (MMC) DNS snap-in. Select the Win2K DNS server and open its Properties dialog box. Go to the Advanced tab and select Non RFC (ANSI) from the Name checking drop-down list. Select Non RFC (ANSI) to permit the use of the underscore in a name.

Discuss this Article 8

Greg Huston (not verified)
on Jul 31, 2003
This will not cause any direct problems with DNS during upgrade. Be warned, however, that if you name either the domain or a server with an underscore or other non-ANSI character, that Internet Explorer clients will not accept cookies from a Web server in this domain. This means that you will need to access the Web server by IP address, not computer name. If your clients do not access the Web server by IP address, the Web server will appear not to store IIS session variables and may actually break some Web applications that make use of IIS session variables.
Hugues Sauvage (not verified)
on Jun 14, 2004
Does the answer respond to the question ? Why do they have to put an underscore for their DNS domain name ? even if they have a NetBIOS name with an underscore.
ddavid (not verified)
on Oct 14, 2004
Would like to know if this also applies to Windows 2003 server as well.
Anonymous User (not verified)
on Jan 18, 2005
i have a 200 server that has the same name as a website that is on another server. and i cannot acces this site from inside the network.it trys to to log into the server with the same name ect.this server is running active directory. i have heard there is a easy fix for this please help

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