CRM Deployment Manager: MMC has detected an error in a snap-in

Got some rare issue here, running CRM deployment manager in server, as screen capture below:
MMC could not create the snap-in.
CLSID: FX:{1ac9de3e-24ae-480d-9e15-65386b76e433}

First thing comes into my mind is to check for the following things:

• Run as administrator
• Run with user that used to install crm
•  Run with domain admin account
• ping domain controller, IP address

 unfortunately, still cannot resolve the issue, event log is throwing me:
Unable to obtain DNS hostname of Active Directory domain controller with ntdsa object name "CN=NTDS Settings,CN=WIN-6H9L2IUM336,CN=Servers,CN=Tier3DC,CN=Sites,CN=Configuration,DC=mydomain,DC=com".

 If you guys faced similar issues, try following solution;

1. open regedit, navigate to :HKLM\Software\Microsoft\MSCRM
2. Right Click and click on NewString value as "PreferredDc"
3. Add the value to PreferredDc is YourDomainControllerName
4. We can find this in AD by typing the command in command prompt echo %logonserver%

CRM outlook client prompt logon screen multiple times

Internet Explorer 7 used with CRM outlook client may caused some CRM auto logon issue. I was prompted multiple times of logon when I click CRM folder.

KB934243 addressed this issue with some workaround.

If you happen to hit this kind of issue, just follow the steps below:

1. Goto regedit
2. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_SUBDOWNLOAD_LOCKDOWN
3. Right-click Outlook.exe, and then click Modify.
4. In the Value data box, type 0, and then click OK.