1. On the vRanger server browse to :\Program Files (x86)\Quest Software\vRanger\Client.
2. Open the file Vizioncore.vRanger.Client.Shell.config with a text editor like notepad
3. Find entry <!-- Value in seconds sets the time out for the wait form -->
<add key="WaitFormTimeout" value="120" />
4. Adjust value to 600 or 1200 or possibly longer depending on how larger the given Vmware environment is\
5. Try and create a replication job and or refresh inventory and see if all ESX(i) hosts will show up now.