IPv6 port forwarding fails

Hi all,

I've a Windows 2003 Server Standard Edition SP1 with the IPv6 stack
installed. I've configured it to be a port proxy between IPv6 and IPv4, that
is, it listens to several IPv6 ports and forwards the received packets to
other IPv4 host.

This feature is setup with the 'netsh int portproxy v6tov4' command.

It usually works well but some times there is a port (and only one) that
doesn't forward the packets it receives and I have to delete the
configuration for such a port and re-configure it again to let it work.

Have anyone heard about this problem too? How can be solved?

Regards
Miguel