open connection to microsoft port 3544

Windows 7 home premium 64 bit

My comodo firewall reported an open connection with an IP of
65.55.118.158:3544 which is owned by microsoft.
Anyone know why M$ is doing this? What information are they obtaining?

On Mon, 4 Apr 2011 10:37:20 -0700, richard <> wrote:

>Windows 7 home premium 64 bit
>
>My comodo firewall reported an open connection with an IP of
>65.55.118.158:3544 which is owned by microsoft.
>Anyone know why M$ is doing this? What information are they obtaining?

This is probably related to Teredo tunneling which allows an IPv6
to operate over an IPv4 connection.

http://en.wikipedia.org/wiki/Teredo_...C_and_blocking