Because you ran the prepare-external-server tool, the two servers have the cn=Proxy User entry configured.

  • Run the dsconfig tool. 
    root@proxy-east-01:./dsconfig

>>>> Specify LDAP connection parameters
  
Directory Proxy Server host name or IP address [localhost]:      

How do you want to connect to the Directory Proxy Server at
localhost?

    1)  LDAP
    2)  LDAP with SSL
    3)  LDAP with StartTLS

Enter choice [1]: 1

Directory Proxy Server at localhost port number [389]: 
Administrator user bind DN [cn=Directory Manager]: 
Password for user 'cn=Directory Manager':