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

• 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.

Additional query words: prodnt lanman 3.10 2.20 event viewer

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