Networker 9.2 emergency recovery for vCenter failed

I am trying to VMware vCenter (through vproxy) to ESXi server by emergency recovery option in Networker 9.2.2. I follow the step in page 126-emergency recovery (link https://www.emc.com/collateral/TechnicalDocument/docu85873.pdf) but I had problem with step "Configure the Emergency Recovery". When I enter the hostname or IP address of the target ESX host, username,password and click connect. It shows Hypervisor name "***" is not a valid host. DNS record had configured.