While adding Vcenter server details if you are getting eror like below :
SOAP-ERROR: Parsing WSDL: Couldn't load from 'vm.serverplus.com.tr/sdk/vimService.wsdl' : failed to load external entity "vm.serverplus.com.tr/sdk/vimService.wsdl"
In order to fix that make sure you enter vCenter IP Address /hostanme with http or https
Fr eg. https://vcenter.whmcsglobalservices.com
and
NOT like this vcenter.whmcsglobalservices.com
