Lockdown mode is enabled on the ESXi host
2.Incorrect credentials are entered when adding the ESXi host.
3.Try full fqdn and add again.
4.Check DNS settings on vcenter and ESXi host
5.Your vcenter does not support the ESXi host build number. This issue started to appear after recent upgrade on Esxi 5.5 servers. If your vcenter server is below vCenter Server 5.5 Update 3b you cannot add host running ESXi 5.5 Update 3b. You need to upgrade your vCenter server to 5.5 U3b in order to add ESXi 5.5 U3b host.
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2.Incorrect credentials are entered when adding the ESXi host.
3.Try full fqdn and add again.
4.Check DNS settings on vcenter and ESXi host
5.Your vcenter does not support the ESXi host build number. This issue started to appear after recent upgrade on Esxi 5.5 servers. If your vcenter server is below vCenter Server 5.5 Update 3b you cannot add host running ESXi 5.5 Update 3b. You need to upgrade your vCenter server to 5.5 U3b in order to add ESXi 5.5 U3b host.
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