Windows XP Can't Connect To Server 2012 R2 Domain Posted on by Webmaster IT Support Forum › Forums › Windows › Windows XP › Troubleshooting › Windows XP Can't Connect To Server 2012 R2 Domain Tagged: Domain, Windows Server 2012 R2 This topic contains 1 reply, has 2 voices, and was last updated by McLovin 5 years, 1 month ago. Author Posts June 26, 2014 at 9:00 am #211 WebmasterKeymaster Since upgrading My DC to Server 2012 R2, my Windows XP PCs can’t connect to the domain. June 26, 2014 at 9:05 am #212 McLovinParticipant Your XP PCs can’t connect to the Server 2012 R2 domain because Server 2012 R2 uses SMB 2 and above, whilst Windows XP only supports SMB 1. To fix this, on the Server 2012 R2 domain controllers, install the SMB 1.0 Feature and make the following registry change: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\DependOnService Change SamSS Srv2 to SamSS Srv Then restart the Server (Lanmanserver) service. Windows XP PCs will then be able to connect to the Server 2012 R2 domain. Author Posts You must be logged in to reply to this topic.