Navigation section

name registration conflict

About this tag
The name registration conflict tag covers issues where a computer cannot register its NetBIOS or DNS name because another device on the network has already claimed it. In Windows Server environments, this often appears as 4321 NetBT errors after upgrades or configuration changes. The conflict typically involves an unexpected IP address blocking name registration, which may require identifying the conflicting device and adjusting network settings or removing duplicate name claims.
  1. P

    4321 NetBT errors after in place upgrade from Server 2016 to Server 2025

    I recently ran an in-place upgrade of 2 file servers from 2016 to 2025, upon completion both servers are reporting "The name "(Local Domain Name):1d" could not be registered on the interface with IP address 10.16.1.70. The computer with the IP address 10.16.1.38 did not allow the name to be...
    • perskine77
    • Thread
    • in place upgrade issues multihomed server issue name registration conflict netbios over tcp/ip
    • Replies: 4
    • Forum: Windows Server Forums
Back
Top