{"id":753,"date":"2007-03-25T22:14:36","date_gmt":"2007-03-25T21:14:36","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/2007\/03\/duplicate-computer-name-prevents-active-directory-domain-logon.htm"},"modified":"2007-05-15T09:00:44","modified_gmt":"2007-05-15T08:00:44","slug":"duplicate-computer-name-prevents-active-directory-domain-logon","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2007\/03\/duplicate-computer-name-prevents-active-directory-domain-logon.htm","title":{"rendered":"Duplicate computer name prevents Active Directory domain logon"},"content":{"rendered":"

I came across an interesting problem a few nights back… I locked myself out of a Windows XP computer. Here’s how it happened, along with how I got back in.<\/p>\n

First, I built a new Windows Server and inadvertently used the same name as an existing Windows XP computer. Then I joined the server to an Active Directory domain (from this point on, the machine that was originally using the computer name is unable to authenticate with the domain as its password will have been overwritten when the duplicate machine joined the domain).<\/p>\n

I then turned on the Windows XP computer. Because this machine is a notebook PC and wasn’t connected to the network at the time, I logged in using cached credentials; however after installing a wireless network card and restarting the computer, I was presented with a message that indicated I could not log on to the domain. Unfortunately I didn’t make a note of the exact message at the time, but looking back, I can see the NetLogon event 3210 in the system event log, the description for which which tells me exactly the problem:<\/p>\n

This computer could not authenticate with \\\\<\/em>domaincontroller.<\/em>domainname.<\/em>tld, a Windows domain controller for domain <\/em>domainname, and therefore this computer might deny logon requests. This inability to authenticate might be caused by another computer on the same network using the same name or the password for this computer account is not recognized. If this message appears again, contact your system administrator.<\/em><\/p>\n

Realising my mistake, I logged on using a local account and tried to rejoin the domain. Except that I couldn’t, because, as per Microsoft’s advice, I had disabled the local administrator account when I joined the domain<\/a> and all I had available to me were standard user accounts.<\/p>\n

Luckily Daniel Petri has published an article with a workaround for when a Windows computer cannot log on to a Windows Server 2003 domain due to errors connecting to the domain<\/a>. By removing the network cable and restarting, I could log on as a domain administrator using cached credentials. Then, I enabled the local administrator account and changed the computer name before moving the computer out of the domain and into a workgroup. I then rebooted (with the network cable connected), logged in using the re-enabled administrator account and rejoined the domain (with the new computer name), before disabling the administrator account again.<\/p>\n

Phew!<\/p>\n","protected":false},"excerpt":{"rendered":"

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