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Logon to SharePoint 2010 requires \. Why?

Posted By:      Posted Date: September 10, 2010    Points: 0   Category :SharePoint
We've installed a fairly large number of small SharePoint 2007 environments. All of these have had their own Active Directory, specified to <domainname>.local. These have been accessible from Internet, and have simply had a external DNS pointingwww.<domain>.com to the server.  In these SharePoint 2007 environments we've used Windows Authentication, and logging on has simply been a procedure of specifying username and password. It has worked just fine. However, in our first SharePoint 2010 environment, we're encountering odd problems. We use here NTLM authentication, and  domain name is <domain>.local. The domain name used in Internet iswww.<domain>.com, which points to the SharePoint 2010 environments frontend server. We'd like to login to the SharePoint environment with simple <username> and password, but it fails. We have to explicitely specify <domain>\<username> and then password to login. Why doesn't this work, and is there any relatively easy way to fix this without disturbing the environment? From logon attempts using simply username, these events appear in the Security event log: Log Name: Security Source: Microsoft-Windows-Security-Auditing Date: 7.5.2010 13:15:01 Event ID: 4625 Task Category: Logon Level: Information Keywords: Audit Failure User: N/A Computer: <COMPUTER>.<

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