In server, during ipconfig, I can see two static ipv6 addresses. I manually modify the only one ipv6 address, but the previous one is still kept inside the server without going away after reboot. There is no multiple ipv6 addresses in the NIC. The phantom ipv6 address is fe80::b47f:ba23:92e8:9c8%11. Is the format correct? How can I remove the phantom ipv6 address?