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I am unable to join windows 7 os to domain, this is the error message

The following error occurred attempting to join domain, The network location cannot be reached

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You have provided very little info on your problem What troubleshooting steps you have tried to resolve the problem? Have you tried to ping the DC from the workstation and vise versa? Try using tracert to see if there are any problems in between those. And also check this section of the forum to see the proper way to ask a question. – Spirit Feb 14 '12 at 8:21
hi thanks for replying, i have tried starting the tcpip/net bios helper service but no luck and also am able to ping my dc and viseversa – techsrini Feb 14 '12 at 9:09

Make sure the AD-server is your primary DNS server.

Also, make sure the TCP/IP NetBIOS Helper Service is running. You can do this like this:

  1. Log on to the client computer by using an account that has administrator permissions.
  2. Click Start, click Run, type services.msc in the Open box, and then click OK.
  3. In the list of services, double-click TCP/IP NetBIOS Helper Service.
  4. In the Startup type list, click Automatic, and then click Apply.
  5. Under Service status, click Start to start the TCP/IP NetBIOS Helper Service.
  6. When the service is started, click OK, and then quit the Services snap-in.

More info: KB329866

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