SEP Client (12.1.5) can't install on SEPM server

Hi there.  I am recently evaluating Symantec Endpoint Protection 12.1.5 in our environment.  I've got the SEPM server installed on Windows Server 2008 R2, played with the policies, and deployed the SEP client to Window 2012 server through Remote Push method, all seems working fine.  However, when I try to deploy the SEP client to the SEPM server, once I selected the SEPM server as the target to deploy the SEP client and entered the domain admin account credential, the wizard responded login to the SEPM server failed, client can't install on the remote computer.  I've disabled the firewall on the SEPM server, tried with the Remote Push and deploy through a package, still getting this same error message.  Had any of you encounter this issue?  Thanks.