We changed our Windows Server 2008 R2 from a workgroup to a domain and now
we are haveing some connection issues with some PC'S. It look like the XP machines
mostly but Windows 7 has done it twice or so.

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Done what twice? Please post an unedited ipconfig /all from server and problem client.


Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows]

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Hello,

Would you please provide more information regarding your difficulties in joining the clients to the domain. In most cases, it could be a DNS problem.

Troubleshooting Active DirectoryRelated DNS Problems

http://technet.microsoft.com/en-us/library/bb727055.aspx

Troubleshooting Domain Join Error Messages

http://social.technet.microsoft.com/wiki/contents/articles/1935.troubleshooting-domain-join-error-messages.aspx


Thanks
Zhang

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Hello,
important is that you use ONLY the domain DNS servers on the NIC and none else, like the ISPs DNS server or your router. ISPs DNS servers have to be added as FOrwarder in the DNS management console under the DNS server properties.Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog:
http://msmvps.com/blogs/mweber/


Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

There is an amazing pack of free network admin tools. click here to download it