When you’ve added Vmware ESX into VMM 2012 via Vmware Vcenter Integration, the Host Status is listed as “OK (Limited)”. You will not be able to deploy Virtual Machine with this status.
In order to get the status “OK”, you need to perform below resolution
1. Import the certificate and public key
Right click the ESX server , select Properties and click on Management. Click on “Retrieve button and tick “Accept both the certificate and public key for the host”