Verify that the vCenter Server IP address is reachable from the vRealize Network Insight Proxy VM. Log in to vRealize Network Insight Proxy CLI and use the ping to ensure that IP is reachable and telnet to ensure that the vCenter Server is reachable on port 443. If vCenter Server is reachable, then retry adding.
I love this stuff. It's a very light yet dependable cleaner. I recently stopped using bleach to clean with and fabuloso in the bowl once a week has kept my toilet sparkling clean without bleach!!!!!! 1  People & Blogs. 2  Standard YouTube License.
Also, vinegar can be used in place of bleach for a lot of cleaning. It's way, way less toxic. Very few things ever need to be truly sterilized, moldy surfaces and particularly foul toilets being the only exceptions I can think of.