Customers had started to report that ipconfig /flushdns now requires Local Administrator rights.

C:\>ipconfig /flushdns
The requested operation requires elevation.

Not all customers are seeing that though.
(Microsoft has gone and changed something.  Not sure what yet.)

Workaround using PowerShell
The Clear-DNSClientCache command will do this instead.

NAME
Clear-DnsClientCache

SYNOPSIS
Clears the contents of the DNS client cache.

SYNTAX
Clear-DnsClientCache [-CimSession <CimSession[]>] [-ThrottleLimit <Int32>] [-Confirm] [-WhatIf]
[<CommonParameters>]

DESCRIPTION
The Clear-DnsClientCache cmdlet deletes all the contents of the DNS client cache. Running this cmdlet is
equivalent to running ipconfig /flushdns.

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