have you reviewed ms kb: 273479 ?

On Sat, Nov 22, 2008 at 11:03 PM, Andrey Fyodorov <afyodoro@...> wrote:
> We have been observing some strange behavior recently with our clients
> accessing PF stores.
>
> We have a mixed Exchange 2003/Exchange 2007 environment right now with
> Exchange servers in various geographical locations.
>
> There are no PF stores on Exchange 2007.
>
> There are Riverbed Steelheads optimizing WAN traffic between locations.
>
> We have been receiving calls from our WAN engineers saying "there are
> a ton of RPC connections from all over the world connecting on port
> 58599 to the Exchange server in Geneva". Then the next day ""there are
> a ton of RPC connections from all over the world connecting on port
> 1200 to the Exchange server in Zurich". Etc.
>
> These client connections eat up all their Steelhead sessions and ruin
> optimization.
>
> When we examine the connections, it turns out that there are a bunch
> of logons on the "victim" Exchange server's PF store from clients all
> over the world - NYC, Amsterdam, Dublin, Sydney, Miami, etc.
>
> It seems that they are all connecting to the "victim" Exchange server
> for OAB downloads or Free/Busy. There is really no other PF replicas
> for example on a Zurich Exchange server that the clients from Miami
> may be possibly connecting to.
>
> But why aren't they connecting to the OAB or Free/Busy replicas right
> on their own Miami Exchange server?
>