PHP fsockopen failed when accessing through IPV6

When i try creating xml-rpc based application using php. It show that it cannot get 200 status.

Then i try ping localhost through command prompt. It's a suprise then, the ping result is IPV6 which is ::1: for localhost.

I try to nonactivate IPV6 localhost in window/system32/drivers/etc/hosts and remark ipv6 address. Then I try to ping again, it result 127.0.0.1 then amazingly, my xml-rpc application is working.

My Computer is Vista, i think it just a matter turn off ipv6 so ping will always return ipv4 address.

i am trying xml-rpc using : codeigniter xml-rpc,incutio

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