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

By | February 5, 2016

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 conditions :

– You have specified /32 prefix for single IP(s)
– You have one or multiple subnets or IPs specified more than once in the allowed IP field

The syntax should be as the following example :,,