Just a quick steps to access ADUC MMC from Domain A to Domain B where as no explicit and cross forest trust has been setup.
Prerequisites:
- At least an Domain user account from Domain B
- Network ports LDAP 389 should be opened for Domain B domain controller
- ADUC tools must be installed at source
Procedure:
From a CMD (as admin) run:
runas /u:DomainB.com\Username /netonly “mmc %windir%\system32\dsa.msc /server=domainB domain controller”
(will prompt for password) : submit the domainB user password
Here will open the ADUC console, feel free to comment and suggestions.