Event ID 5721 When Upgrading LAN Manager BDC to Windows NT BDC

 Last reviewed: May 26, 1995
Article ID: Q130742
The information in this article applies to:
  • Microsoft Windows NT Advanced Server version 3.1
  • Microsoft Windows NT Server version 3.5
  • Microsoft LAN Manager to Windows NT Advanced Server Upgrade
  • Microsoft LAN Manager version 2.2

SYMPTOMS

When you upgrade a LAN Manager backup domain controller (BDC) to a Windows NT BDC, the NetLogon service terminates and the following is written to the system log: 

   Event ID: 5721
   Source: NetLogon
   Type: Error
   Description: The session setup to the Windows NT Domain Controller
   <domain controller name> for domain <domain name> failed because
   the Windows NT domain controller does not have an account for the
   computer <computer name>.

CAUSE

This problem occurs if the computer name is the same as an existing user name. For example, if you upgrade a LAN Manager BDC to a Windows NT BDC with a unique computer name and then change the computer name to the replaced LAN Manager BDC, the above symptom occurs.

When you create a Windows NT primary domain controller (PDC), the PORTUAS utility is run to convert the LAN Manager user account database (UAS) to a Windows NT security accounts manager (SAM) database. LAN Manager servers have a users group called SERVER, which contains the computer names of the servers as users. This group and its users were ported to the Windows NT PDC.

RESOLUTION

To correct this problem:

  1. Shutdown the new Windows NT BDC.

  2. On the Windows NT PDC, remove the BDC computer name from the SERVER group in User Manager for Domains.

  3. In Server Manager, remove the BDC computer name and synchronize with the domain.

  4. After the synchronization is complete, add the BDC computer name and synchronize with the domain again.

  5. Restart the Windows NT BDC.

NOTE: If the domain becomes a Windows NT-only domain, you may want to remove the SERVER group and the individual user names in the group.

KBCategory: kbnetwork
KBSubcategory: ntdomain ntinterop ntsecurity
Additional reference words: prodnt lanman 3.10 3.50 2.20 event viewer

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Last reviewed: May 26, 1995
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