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.
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Turn the water supply back on and flush once the bowl is clean. Trisodium phosphate, a heavy-duty cleaning powder that can be found at your local home improvement store, is another great product that can be used to remove tough toilet stains.