6 Replies Latest reply on May 16, 2019 1:59 PM by DineshMahesh6969

    Cannot modify any virtual machines in vSphere Web Client 5.5 - Cannot complete operation due to concurrent modification by another operation.

    CMcKown Lurker

      This is killing me. All I want to do is add an additional NIC to two VMs. I can't. This is a new installation. I have 5 running production VMs plus the vcenter appliance. Things WERE working fine and just quit working out of the blue.

      I can't even "connect" an ISO image to a CDROM.


      I tried powering down the VM with no change. (Actually the VM never would even show is was powered off in the client, but since the only power option was "power on" at this point, I assumed it was off.)


      I can't modify ANY VMs at all. I have restarted the vCenter Appliance with no change in behavior. Why are we forced to use this horrible Web Client??????


      Running 5.5 build 1750787 - Have been pushing to sell hyper-v since the support options for vmware are cost prohibitive for SMB, but vendor for this customer requested vmware.