[strongSwan] Does windows 7 clients work well with l2tp/ipsec using strongswan?

[Morgan]

Hi,
   Recently i set up vpn on vps with ubuntu 11.10. I have configured
l2tp/ipsec using strongswan.
I tested the vpn by ios/android/win7 behind nat. All goes well. I can use
my ipod touch to watch
youtube videos well. The only problem i face is in win7 i can access common
sites or play wow
through vpn. But i cant download files from websites or watch youtube
videos.When i do such things,
the tunnel seems to be hang, at the same time i cant access other sites
too.But ping still works well.
And i must reconnect to return normal. I dont  give any configure or logs
here, just want to know
if it is a normal situation.
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