If you are unable to add an ESX host back to the vCenter Server or a License key for this ESX already exists in ADAM database this error message may be reported.
The license key entered does not have enough capacity for this entity
If this issue occurs, check to see which key needs to be deleted in the ADAM database. As outlined in step 8 in the resolution section, when connected to the ADAM database and after expanding OU=LicenseEntities, you can see different key entries for each host. Right-click the containers until you locate the ESX host name or IP address with the issue. After it is located, click Delete and then retry adding the ESX host back to vCenter Server.
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How to stop, start, or restart vCenter Server servicesManually backing up and restoring the VMware vCenter Server 4.x and 5.x ADAM instance dataVMware vCenter Server 4.x および 5.x からライセンス キーを削除できない无法从 VMware vCenter Server 4.x 和 5.x 移除许可证密钥