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FIX: The connectivity test that is run by the Dcdiag.exe tool fails together with error code 0x621Article ID: 978387 - View products that this article applies to. On This PageSYMPTOMSConsider the following scenario:
Testing server: <site>\<DCNAME>
Starting test: Connectivity * Active Directory LDAP Services Check Message 0x621 not found. Got error while checking LDAP and RPC connectivity. Please check your firewall settings. ......................... <DC Name> failed test Connectivity
CAUSEThis issue occurs because the Dcdiag.exe tool does not use a reliable method to check whether a network connection is a physical interface on a computer that is running in Windows Server 2008 R2. When the teaming network interface is installed, the tool incorrectly detects that the interface is not a physical network interface, and then the tool outputs error code 0x621. RESOLUTIONHotfix informationA supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: http://support.microsoft.com/contactus/?ws=support Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
(http://support.microsoft.com/contactus/?ws=support)
PrerequisitesTo apply this hotfix, your computer must be running one of the following Windows operating systems:
Restart informationYou do not have to restart the computer after you apply this hotfix.File informationThe English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.For all supported x86-based versions of Windows 7Collapse this table
For all supported x64-based versions of Windows Server 2008 R2Collapse this table
Additional files for all supported x86-based versions of Windows 7Collapse this table
Additional files for all supported x64-based versions of Windows Server 2008 R2Collapse this table
WORKAROUNDTo work around this issue, run the Dcdiag.exe tool from the command prompt of a remote computer by using use the /s parameter to point to the domain controller that is running Windows Server 2008 R2. STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. REFERENCESFor more information about the Dcdiag.exe tool, visit the following Microsoft TechNet Web site: http://technet.microsoft.com/en-us/library/cc731968(WS.10).aspx
(http://technet.microsoft.com/en-us/library/cc731968(WS.10).aspx)
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