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Why do I receive an error when I access some Active Directory (AD)-related Microsoft Management Console (MMC) snap-ins?
John Savill
December 3, 2002
1 Min Read
A. The AD tools use Lightweight Directory Access Protocol (LDAP), which by default operates on port 389, to contact the directory service servers. If you enable TCP/IP filtering, block port 389, and keep only port 80 open for Web page communication, you might encounter the following problems when you attempt to access AD MMC snap-ins:
When you attempt to start the MMC Active Directory Users and Computers snap-in, you receive an error message that reads
"Naming Information cannot be located because: The Server is not operational.Contact your system administrator to verify that your domain is properly configured and is currently online."When you attempt to start the MMC Active Directory Sites and Services snap-in, you receive an error message that reads
"Naming Information cannot be located because: The server is not operational.Contact your system administrator to verify that your domain is properly configured and is currently online."When you attempt to start the MMC Active Directory Domains and Trusts snap-in, you receive an error message that reads
"The configuration information describing this enterprise is not available. The server is not operational."Log on processing is very slow.
To resolve these errors, perform the following steps:
From the Control Panel, open the Network Connections applet, select the network adapter from the list, right-click the network adapter, and select Properties.
From the General tab, select Internet Protocol (TCP/IP), then click Properties.
Click the Advanced button.
Select the Options tab.
Select "TCP/IP filtering", then click Properties.
For "TCP Ports", select "Permit All."
Click OK to close all dialog boxes.
Restart the computer for the changes to take effect.
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