Yes, the user has both the Client and the Administration Console on their workstation.

Please make sure that the user had Admin rights. 

So this is not logging into the repository.  This is simply registering the server in the admin console before even logging in.  Are you talking about local admin rights on the machine or admin rights in Laserfiche? 

We are not trying to create or register any repository.  We are trying to simply register the server in the Administration Console.  When you first open the Admin Console it asks you for the name of the server.  

It finds the server name but we cannot connect to it because of Access Denied.  We can register the repository/see the server no problem through the full client.

Do you have a firewall or security software on the server that might block that connection? Does the admin console on the sever connect with error?

No that I am aware of.  The question is, is the traffic between the admin console and the server different than the client and the server?  Client connects and works fine.  Admin console connects and works fine from the server.  Probably best to start a support case.

Is the user able to login to the Client once they have attached it to the server? Is the user a named user already?

Yes, they can log into the Client.  They are a named user using Windows Authentication.  

What port is the LF server service using?  If the port was changed, did you use that when registering the server in the Admin console as well?