Edge Subscription Failing

Hi,

We are in the process of configuring Exchange 2007 SP1. All internal and external mails are ok without the edge option. But this time, when i’m about to subscribe to the edge, i am getting this error “The version of the Edge subscription doesn’t match any Hub Transport servers in the subscribed site”

– Time sync are ok.

– all related prereq is ok as well like the ADAM, etc.

Any idea about this prob? i search in google and it only gave me a couple of hits.

Thanks.