Password reset latency - Single forest, multiple sites.

Hi,

I have the following situation :

1 Windows Server 2008 R2 forest with 3 sites (A,B and C).  The PDC emulator for the forest is located in Site B.

A password reset for UserA is being performed in Site A.  UserA then tries to login to Site C but fails authentication with the new password (the old password works).

UserA is able to login to SiteB with the new password fine straight away.  UserA is able to login to siteC with the new password after about 10 minutes.

I don't see why the authentication is failing in SiteC ?  I thought 'PDC Chaining' would query the PDC emulator in the forest for any password changes etc ?

http://www.frickelsoft.net/blog/?p=199

Thanks

Bill