现在客户端无法加入域.而且AD用户和计算机无法打开. 错误信息如下：找不到命名信息，因为：指定的域不存在，或无法联系。请与系统管理员联系，以确认您的域是否配置正确而且处于联机状态。
回答：根据您的描述，我对您提出的问题的理解是：您不能访问AD用户和计算机，并且客户端无法加入域。基于您的状况，我建议您尝试下面步骤：
1. Click Start, point to Programs, point to Administrative Tools, and then click Services.
2. Click Services MMC.
3. Start the Windows Time service.
4. Under Startup Type, click Automatic. Restart the service.
5．Check Netlogon service Startup value to see if it has been set to Automatic. Restart Netlogon service.
6. Restart the server.
7. Make sure the two services have been started.
8. Check the issue again.
272686: Error Messages Occur When Active Directory Users and Computers Snap-in Is Opened
http://support.microsoft.com/kb/272686/en-us
261203: Error Messages When Windows 2000 Client in Windows 2000 Domain Attempts to Open Active Directory Snap-in
http://support.microsoft.com/kb/261203/en-us
赵莹(Ken Zhao) MCSE 2000 微软全球技术支持中心
