After upgrade from Vcentre from 6.5 to 7.0, not able to connect to V-center and all VMware back up job failed

Netvault server version : NetVault 12.3 Netvault server OS : RHEL 6.2 Netvault client version : Vcenter 7.0.3 Netvault client OS: VMware Photon OS Vcenter appliance is upgraded from version 6.5 to 7.0 Error Message : Failed to connect to server. Reason unknown Netvault server is unable to connect to vcenter server after update. Is there any configuration that has to be made on the vcenter server for enabling backup?