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I have a windows system with an IPv4 address and an IPv6 address and I'm trying to figure out how to release my IPv6 address.

I've tried ipconfig /release6 and I get this error

An error occurred while releasing interface Local Area Connection : The system cannot find the file specified.

An error occurred while releasing interface Loopback Pseudo-Interface 1 : The system cannot find the file specified.

No operation can be performed on isatap.{6B874193-B28A-4446-B6E6-8ADAC22E5090} while it has its media disconnected.
No operation can be performed on IP6Tunnel while it has its media disconnected.

I still have my IPv6 address at the end. I can release IPv4 address using ipconfig /release

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You could try just unchecking the IPV6 checkbox in the properties of your network adapter. –  PnP Jun 10 '12 at 15:42
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Seems like your command prompt is not elevated, thus the errors. Moreover, you can only release addresses assigned by DHCP, are you sure your IPv6 address is assigned in this way (most are auto-configured and not assigned via DHCP). –  haimg Jun 10 '12 at 16:55
    
It might be useful to post the output of an ipconfig /all. –  jmreicha Jun 11 '12 at 17:01
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