Category Archives: Virtualization

VMware : Power on virtual machine cannot be found

I have encountered the following issue lately trying to power on a virtual machine with a limited permission user using the vSphere Web Client : The “Power on virtual machine” operation failed for the entity with the following error message. Virtual machine cannot be found. This happened with a regular user with the appropriate role… Read More »

VMware : Call “HostFirewallSystem.UpdateRuleset” for object “firewallSystem” on ESXi failed

Having the following error trying to apply IP restriction in the ESXi firewall using the vSphere client? Call “HostFirewallSystem.UpdateRuleset” for object “firewallSystem” on ESXi “” failed. Operation failed, diagnostics report: Sysinfo error on operation returned status : Already exists. Please see the VMkernel log for detailed error information This behaviour can happen under the following… Read More »

VMware : PCPU 3 locked up. Failed to ack TLB invalidate.

The following error is usually represented by a “pink screen of death” with the following output : PCPU 0 locked up. Failed to ack TLB invalidate. @BlueScreen: PCPU 0 locked up. Failed to ack TLB invalidate. NMI IPI received. Was eip(base):ebp:cs [0x76a42(0x41802f800000):0x412520x4010](Src 0x1, CPU2 The cause is that when interrupt occur, a context switch must… Read More »

VMware : Removing ghost network in ESXi/vCenter

I recently had the following issue in vCenter  : A non-existent network still associated with a virtual machine but marked as inactive. The VM has no longer any network interface mapped to that network but it still show in the network map and the VM overview. It turned out that a snapshot for this VM… Read More »

VMware : Error 503 Service Unavailable connecting to vSphere Web Client

Having the following error trying to connect to the VMware vSphere Web Client? 503 Service Unavailable (Failed to connect to endpoint: [class Vmacore::Http::LocalServiceSpec:0000000002D9B4A0] _serverNamespace = /vsphere-client _isRedirect = false _port = 9090) This is usually caused because the “VMware vSphere Web client” service has stopped unexpectedly or not started on boot. This service is and… Read More »

VMware : Deprecated VMFS volume(s) found on the host

Having the following notification after adding a new VMFS volume to your VMware vSphere/vCenter 6? Deprecated VMFS volume(s) found on the host. Please consider upgrading volume(s) to the latest version. If this message show up even though they are at the latest version, it mean you have hit a known issue of vCenter 6 (which… Read More »