Logging into Automation Engine receive "U00003210 Logon error :Acces denied" error

Document ID : KB000087594
Last Modified Date : 14/04/2018
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Error Message :
U00003210 Logon error :Acces denied

Unable to log into the Automation Engine (AE) and receive the above error message.  

This issue can be related to not using the correct credentials (Client/UserID/Department/Password) when attempting to log into AE.  

Login errors can be caused by:
  1. Spelling errors when type in the Credentials 
  2. Using the wrong Credentials 
If you receive this error, ensure that you are using the correct values and that you have no misspelled words for any of the credentials:

Once the correct credentials are entered, you will no longer receive the 'Access denied' error and you will be able to log into AE.

OS: Windows Server 2012
Cause type:
Root Cause: Can't connect to administration client due to :
1) Use of Client 100 with UC/UC rather then Cleint 0
2) Use of uc/uc parameters rather then UC/UC
This field was added on 30/03/2017. This article has not been updated yet. Refer to the "Description" or "Workaround" sections for solution information.

Fix Status: No Fix

Additional Information:
Workaround :
1) Connect to UI with the right credentials 0100/UC/UC2) Create a new user 3) Give the right Authorization and Privileges 4) Assign them to the client