If your company implemented firewall and blocked public NTP server, you may see installation of vRealize Operation Manager pending on ./install.sh on console. That’s because the installer tries to negotiate with NTP server www.iana.org. The firewall blocked the traffic.
VMware TAM Manager Shan told me there are two options on firewall to block traffic: REJECT and DROP. REJECT means firewall responding to the request and let source device knows it’s rejected. DROP means firewall immediately ignores the request and no responding to source device. Looks like there is a bug in vROPs code that it hung if NTP request gets drop and no responding.
The workaround is create a port group without physical uplinks and install vRealize Operation Manager. Then move it to proper network after installation is completed. You can configure correct IP addresses when import the OVF file so later on you just need simply move the network.