Active Directory Server registry could not be accessed

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at]  

Topic Last Modified: 2005-11-17

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry on each domain controller:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\CurrentVersion\CurrentVersion

If the Exchange Server Analyzer cannot read this registry value for any reason, the Exchange Server Analyzer displays an error.

To correct this error

  1. Make sure that the domain controller has been started and is connected to the network.

  2. Use the PING command to see if the domain controller is reachable.

  3. If there is a firewall, check to see if RPC ports are blocked.

  4. Make sure that the Remote Registry service on the domain controller has been started.

  5. Examine the permissions for the account under which the Exchange Server Analyzer is running. The account under which the Exchange Server Analyzer is running must have Administrator permissions on each domain controller that it is scanning.

For more information about troubleshooting network connectivity problems, see the following:

For more information about port requirements, see the Knowledge Base article 832017, "Service overview and network port requirements for the Windows Server system" (