Can anyone tell me what IP inspections really inspect?
I have 2 sites connected through site-to-site vpn. ACL allows ip packets going through both sites. But the application level firewall still inspect the packets and droppes smtp packets between 2 private network.
I've found some paper in ms support. Here is the link.
Can anybody tell me how to configure the firewall to make exchange work between site-to-site vpn?