Thank you for your posts; sorry to take so long to update this.

The problems have been resolved. First problem was due to the server's DNS domain name having been changed (without my knowledge :-( - once fixed, the WRB problem resolved itself.

And, of course, the admin server page couldn't be accessed until the admin server was running (which required WRB...). Even so, it was necessary to use <machine_name>.<domain>:<admin_port_nbr>, whereas in our other environment the port number isn't mandatory.