Navigation section

in place upgrade issues

About this tag
In place upgrade issues on Windows Server often involve network registration errors after migration. A common problem is NetBT name registration conflicts, such as the 4321 error, where a server cannot claim a name due to another device on the network. This can occur after upgrading from Server 2016 to Server 2025, even when DNS settings appear correct. Troubleshooting may require investigating the conflicting IP address and ensuring no residual services interfere with name resolution. These issues highlight the need for careful post-upgrade validation of network services.
  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