arp -d * The ARP entry deletion failed: The parameter is incorrect

Question

Hi everyone,

OS information:

Windows 10 Home
Version 20H2
OS Build: 19042.1052

I am attempting to use command prompt as an elevated user and clicking run as administrator as well too in order to run this command:

arp -d *

In the help documentation for arp /? it states:

-d Deletes the host specified by inet_addr. inet_addr may be
wildcarded with * to delete all hosts.

Therefore my query is adhering to the help files syntax with: arp -d *

However, the command fails to execute and if I check my arp table before and after running the command there is no changes. I even attempted this command in powershell and received the same error. I also tried not clicking run as administrator and got a different error message: The ARP entry deletion failed: The requested operation requires elevation.

Can anyone provide any assistance in running this command successfully in command prompt running as administrator?

arp -d *
The ARP entry deletion failed: The parameter is incorrect.

Any help will be appreciated - thanks.

Answer 1

Hi，

I have seen some similar threads and most of them use netsh interface ip delete arpcache as a workaround.

For the command of arp -d * didn't work, you may try some general steps:

1.Run sfc /scannow to repair any corrupted system files.

2.Do a clean boot and check if arp -d * can work. This can narrow down whether the issue is related with the third-party software.

3.Create a new user account and login with new account, see if the command can work.

If the above steps still didn't work, then we need to trace some log to find the cause. However, analysis of log is beyond our forum support level and due to forum security policy, we have no such channel to collect user log information. So, if you want to find the cause, we recommend you open a case with MS Professional tech support service, they will help you open a phone or email case to Microsoft, so that you would get a technical support on a one-to-one basis while ensuring private information.

Here is the link:

https://support.microsoft.com/en-us/gp/customer-service-phone-numbers

Best Regards,
Candy

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Answer 2

Hi,

The command of arp -d * works fine in my lab. You might try to run netsh interface ip delete arpcache and then check whether the entries have gone.

Best Regards,
Candy

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Answer 3

Yes it is a real head scratcher on why it doesn't work and throws up an error. I had a friend run the command successfully too. I have tried the netsh interface ip delete arpcache and it worked successfully. However, I try to run the arp -d * afterwards and it still throws up the same error.

Has anyone encountered this before?