Unable to create a new user in vCO - LDAP error 53

Hi Guys,

     It seems to be an old topic, but it is still unsolved properly.

     I'd like to create a new user in vCO workflow, and I've read this discussion: http://communities.vmware.com/message/2190530#2190530

     We faced the same problem, same error, and I've gone through all the solutions offered in that discussion, which are:

• create a user in either a group or OU with or without a password
• Active Directory version: 1.0.2  vCenter Server version: 5.1.0
• Domain Controller Authenticate Certificate imported to vCO
• Use SLL - checked
• No worries for the ACCESS RIGHT, I'm the admin, I can do anything
• Server and client restarted a million times

     However, it still does not work, keep throwing me the same error:

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     Any further insight into this issue will be much appreciated.

     Thank you,