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aag
Asked: 2016-07-07 10:38:56 +0800 CST

powershell: Remove-DhcpServerv4Lease does not remove existing leases

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I want to delete all DHCP leases and reservation from server WSKELLER. From the documentation I seem to understand that this would be accomplished with:

Get-DhcpServerv4Scope -ComputerName WSKELLER | Remove-DhcpServerv4Lease -ComputerName WSKELLER

The cmdlet does find all the leases, yet it throws for each lease the following error: 

Remove-DhcpServerv4Lease : Failed to delete lease 10.10.12.32 from scope 10.10.0.0 on DHCP server WSKELLER.
At C:\admin\removeDhcpDns.ps1:8 char:48
+ ... mputerName WSKELLER | Remove-DhcpServerv4Lease -ComputerName WSKELLER + 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : ResourceExists: (10.10.12.32:root/Microsoft/...cpServerv4Lease) [Remove-DhcpServerv4Lease], CimException
+ FullyQualifiedErrorId : DHCP 20019,Remove-DhcpServerv4Lease

Obviously I am doing some mistake. But which one?

powershell dhcp

1 Answers

  1. Best Answer

    From your error: + FullyQualifiedErrorId : DHCP 20019,Remove-DhcpServerv4Lease

    From: https://msdn.microsoft.com/en-us/library/windows/desktop/aa363378(v=vs.85).aspx

    ERROR_DHCP_RESERVED_CLIENT 20019 The specified DHCP client is a reserved client.

    It looks like you're trying to delete a reservation. If that is intentional, then you will need to use the Remove-DhcpServerv4Reservation cmdlet instead.

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