The following error occurred validating the name workgroup
The importance of this message very much depends on the rold of the computer in your installation.
Active Directory wants a fully qualified domain name (your host name plus the domain name) of at least two labels, perferably three: for example maui.(where maui is the machine name and is the domain name). Having said that, if it is on the Internet, then you should change it (IMHO). Your system will, of course, change it's dynamic DNS registrations, but if you're on the Internet, dynamic DNS should probably be turned off anyway. What to change it to - well that's a tougher question.
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So if you host bar and foo, but the default website is then name the domain OK, so I've done as the Event log instructions stated...
To correct this problem: 1) open Control Panel 2) open System applet 3) select Network Identification tab 4) click the "Properties" button and enter a domain name or workgroup name; this name will be used as your DNS domain name.