Could Not open some sites from Windows Vista and Server 2008 when using FreeBSD as gw

[Владислав Недосекин]

We are using FreeBSD as GateWay with PF.
And the problem is that some web-sites as Gmail.com or Msn.com are
unavailable from machines with Vista or Server 2008 installed.
If use external or internal proxy (Kerio WinRoute, wich also goes through
the same FreeBSD gw) they are opening correctly.
Also in 6.1 version were problems with skype from such machines.