Symptom
When using a Windows 2000 server for authentication, an Active Directory Group name is accepted for authentication with any nonblank password.
Solution
Normally, this should only grant guest access. But an issue exists in Windows 2000 that results in authentication. Check with Microsoft for updates to Windows 2000 that may resolve this issue.
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The following article can help you search for a particular vendor's address and phone number:
Article 17159: "
Locating Vendor Information"