1.    30 Mar 2016 #1
    Join Date : Jul 2015
    Posts : 102
    Windows 10

    DHCPv6 errors

    Since installing a new modem/router (gateway for Comcast) two DHCPv6 errors, rarely seen earlier, have been appearing with some regularity...

    "Your computer has lost the lease to its IP address 2601:1c0:5702:9370::1 on the Network Card with network address 0xF46D043BC2BE."

    "Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 0xF46D043BC2BE. The following error occurred: 0x5B4. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server."

    To banish them, the following has been tried.

    ipconfig /release
    ipconfig /renew
    ipconfig /flushdns

    Various forums have been reviewed, with no definitive solution. SFC shows no errors. Windows 10 Pro, build 1511.

    Both Comcast and Arris (gateway manufacturer) disclaim responsibility for the messages. Clues?
      My System SpecsSystem Spec

  2.    31 Mar 2016 #2
    Join Date : Oct 2014
    Posts : 1,540
    Windows 10 Pro x64

    Have you tried to setup DNS IPv6 servers manually?

    You could also try some of those reset commands:

    [Batch] Windows Network Fix - Pastebin.com

    For the record, unless you need IPv6, it is better to disable it.
      My System SpecsSystem Spec

  3.    03 Apr 2016 #3
    Join Date : Jul 2015
    Posts : 102
    Windows 10

    Continued observation has confirmed that the message is generated when DHCPv6 lease time (default one-hour) expires. Apparently the prior modem had a longer expiration, so the error rarely appeared. Expiration time setting in the new unit has been increased.
      My System SpecsSystem Spec

  4.    03 Apr 2016 #4
    Join Date : May 2015
    Central IL
    Posts : 2,589
    EL Capitan

    IPv6 is not being used by ISP's yet, because it opens you up to a huge security risk.

    Just disable it on the gateway and in Windows.
      My System SpecsSystem Spec


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