Access to resource settings on the host is restricted to the server that is managing it: xx.xx.xx.xx.
It is recommended to Deploy OVF/OVA template using vCenter UI when host is managed by vCenter Server. Refer following doc: Deploy an OVF or OVA Template
As a workaround disconnect the ESXi Host from vCenter Server and proceed to deploy ovf/ova using Esxi UI.
Disconnecting host from vCenter command line options
/etc/init.d/vpxa stop
/etc/init.d/hostd restart
/etc/init.d/vpxa start