I'm trying to troubleshoot something here.
I've got on my network 3xTMG's doing reverse proxying. Everything is fine. In parallel, there's a UAG box. Everything is fine.
The trouble starts when trying to add another TMG box in parallel to handle incoming traffic, since the proxy servers are for outgoing (web) traffic only (no listeners exist to handle incoming traffic).
External interface - public IP (connected to cable gateway, but given public IP/public IP as gateway)
Internal Interface - local LAN IP, no gateway, internal DNS (same internal network as the other TMG servers/UAG, as well as the rest of the network)
The trouble is that the new TMG begins to massively disrupt internal traffic, blocking TRAFFIC NOT DESTINED, and making any internal traffic time out. When I can get back and pause the VM, everything works fine. I've dine an access rule to allow "Internal to Internal", all protocols, and not strict RPC filtering. I've also tried the "Anywhere" to "Anywhere" rule to test, no joy.
This is the first time I've seen this (other than my very first install of TMG years ago, when it blocked my BlackBerry BES traffic)
The VM is running Server 2008R2, the NIC's on the problem TMG box are standard Network Adapters (not Legacy), and the host is running Server 2012R2. Everything else is out of the box TMG SP2, RU6.
Any help would be appreciated.