facing problem in creating new user through EAC. through shell its ok. but when i tried through EAC it stuck selecting OU with error "Exception has been thrown by the target of an invocation".. i have multiple child doman user scenario .. its stucks at screen shot 2- and keep on prompting please wait ... help will be appreciated.

use the correct url to access ECP. Do not use https://localhost/ecp or https://servername/ECP . you may try with https://servername.domain.com/ecp.

yes doin the same .. with same result :(

at last i got solution .. just ensure there is no empty OU in AD .. and the domain controllers under "domain controllers" OU resides at root .. mean no nested OU :)

at last i got solution .. just ensure there is no empty OU in AD .. and the domain controllers under "domain controllers" OU resides at root .. mean no nested OU :) Why would you go for nested OU inside the default OUs? ;-) Are you saying that you had an empty OU in the root domain, which caused the error?Rajith Enchiparambil | http://www.howexchangeworks.com |

Why would you go for nested OU inside the default OUs? ;-) i have more then 1 domain controllers and sites .. it was done to implement different policies on different DCs .. and to standardize the things in better way Are you saying that you had an empty OU in the root domain, which caused the error? no the error way bcos of my domain controllers were in nested OU .. i move them to root OU .. at the same time i remove empty OU in my domain (it was for test purpose etc.). not sure if the empty OU were also causing problem .. but for sure it were nested OU under "domain controllers OU" ...

Ive seen the same issue but using the command Set-ADServerSettings PreferredServer changing the preferredserver to a DC fixed the issue http://www.techieshelp.com/exchange-2013-exception-has-been-thrown-by-the-target-of-an-invocation/

I have set-adsserver settings -PreferredServer on all 4 of my servers. I have also restarted necessary services. I am still getting the "exception has been thrown by the target of an invocation" error when i try to select OU in either creating a new user or a new distribution group. I know i can create users via powershell, but i will be having other users create users via ECP and need this to work. Anybody have any suggestions.

step-1: Check "Domain Controllers" OU in active directory users and computers ... and remove if there any nested OU inside. Step-2: remove if there is any other empty OU in active directory users and computers.

i did check our Domain Controllers OU and found we did have a sub OU in there. I moved those domain controllers to the Root Domain controllers and still am having the exceptions issue. After i moved the domain controllers and i restarted the topology service on one of the exchange servers.

I stand corrected. After i moved 2 of my domain controllers from the nested ou, i needed to move that nested OU from the Domain Controllers OU. As soon as i did that i was able to get the Organizational Unit to work inside of the ECP.

good luck