I installed VIN 1.2 in my vsphere5 environment. At first, I saw the tab in my web client, and it went through the discovery. However, ever since, I don't see the tab and can't get into it. Is 1.2 compatible with 5.0? Any idea why it worked once and then disappeared?
VIN 1.2 is compatible with vSphere web client 5.1 and not 5.0.
Another thing to check is the port setting - make sure that the required ports are not blocked by firewall.
See 1.2 documentation for the port settings - https://www.vmware.com/support/pubs/vcenter-infrastructure-navigator-pubs.html.