For anyone who is looking for a solution to this problem, tried everything they could find online but without success: Your vCenter and the host you're trying to add are probably not on the same...
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For anyone who is looking for a solution to this problem, tried everything they could find online but without success: Your vCenter and the host you're trying to add are probably not on the same LAN but connected with a VPN. Lower the MTU of the tunnel to less then 1320. This will solve the issue.
