Microsoft KB Archive/251196

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Cannot Use BackOffice Server Manager to Administer Exchange Server 5.5 in Windows 2000

Article ID: 251196

Article Last Modified on 11/4/2003


  • Microsoft Windows 2000 Server
  • Microsoft BackOffice Server 4.5

This article was previously published under Q251196


After you install the BackOffice 4.5 Server components on a computer running Windows 2000 Server, the following error message may be displayed when you try to administer Microsoft Exchange Server 5.5 using BackOffice Server Manager:

BackOffice Server Manager

The taskpad is unable to list items for 'LDAP://SYSTEM1:389/o=Company, Inc.'.

Check if 'LDAP://SYSTEM1:389/o=Company, Inc.' is spelled correctly, the resource is available on the network, and you are logged in as a user with permission to manage this resource.

Error 0x80072021

NOTE: This error message varies slightly, depending on the computer name and organization name.


This behavior occurs because Windows 2000 Active Directory and Exchange Server 5.5 both use Lightweight Directory Access Protocol (LDAP) port 389 by default.


To resolve this problem, use the following steps:

  1. Click Start, point to Programs, click Microsoft Exchange, and then double-click Microsoft Exchange Administrator.
  2. In the tree pane, expand OrganizationName, expand SiteName, expand Configuration, and then click Protocols.
  3. In the Protocols section, click LDAP (Directory) Site Defaults.
  4. On the File menu, click Properties.
  5. On the General tab, change the LDAP port to 1005 (or another available port).

    NOTE: To check port availability, type the following command at a command prompt:

    netstat -an

  6. Click OK, and then restart the server.


Microsoft has confirmed this to be a problem when you install BackOffice Server 4.5 on a computer running Windows 2000 Server.

Additional query words: fail fails

Keywords: kberrmsg kbenv kbprb KB251196