Restarting vcenter servie will not mpcat the running VM's. One more try is to verify by conneting directly to the ESXi host using vSphere client.
Try restrting venter servie and see anything helps..
Thanks,
Mohammed Raffic,VCAP4-DCA,VCAP5-DCA,VCP4,VCP5,VCP-cloud,MCSA,MCTS,CCA