The last two topics contain detailed diagrams of the network and server views. This section includes the following topics:
This information is useful to developers who require a broad view of Forefront TMG before developing extensions and filters using the Forefront TMG Software Development Kit (SDK). Unlike most of Microsoft’s other products, TMG needs to deal with a strong anti-software-based-firewall sentiment among many network administrators. This section provides basic information regarding the architecture of Forefront TMG. Forefront TMG is currently going up against a large number of SMB firewall products (and a few enterprise ones) and addressing the strengths and weaknesses would’ve been a good addition. Forefront TMG also controls which computers on the Internet can be accessed by internal clients. Forefront TMG monitors requests and responses between the Internet and internal client computers, controlling who can access which computers on the corporate network.
These services are complementary - you can use either or both of these functions when you install Forefront TMG in your network.įorefront TMG secures your network, allowing you to implement your business security policy by configuring a broad set of rules that specify which sites, protocols, and content can be passed through the Forefront TMG computer. If you can fulfill these prerequisites, you can follow the step-by-step guide to secure your Exchange 2010 Server in my next article.Microsoft Forefront Threat Management Gateway (TMG) offers a complete Internet connectivity solution that contains both an organizational firewall and a complete Web cache solution. , Microsoft Forefront TMG Standard 2010 Sngl. must be the certificates principal and has to be listed under “Subject Alternative Name”. Microsoft Forefront TMG Standard 2010 Sngl OPEN No Level 1 Proc. Outlook Web APP (OWA), Outlook Anywhere, and Exchange ActiveSync use the FQDN.Tests to and from the server from within the LAN show that the server can transfer 80MB/s+ out. Our old ISA is still running and the settings on both are identical when it comes to VPN options. This section provides basic information regarding the architecture of Forefront TMG. You have to have Split-DNS configured, which means you use the same domain name for your internal and external network. Morning all, Im trying to solve a rather annoying issue with a TMG box (virtualised). Forefront TMG monitors requests and responses between the Internet and internal client computers, controlling who can access which computers on the corporate network.A working Exchange 2010 and Forefront TMG installation.Prerequisites for securing Exchange 2010 with Forefront TMG ^ We bought 2 HP D元60 G7 servers with 24GB Mem, 4 x 300 SAS disks, 2 x Quad core CPU’s to support 3500 users (in theory). There is no need for them to be installed on separate machines. Recently we migrated our edge Forefront TMG standard machine to a Forefront TMG Enterprise standalone array to create redundancy for incoming traffic (NLB) and outgoing traffic (ISP-R). The Exchange 2010 Client Access Server and the Mailbox Server can reside on the same server. The network topology is pretty simple in my case, but it can be even simpler. However, even though the SSL tunnel does not directly connect the user with Exchange, all network traffic is still secured by SSL.īefore I write about the actual configuration steps, I want to provide you with a picture of the network topology and list the prerequisites of this guide. Thus, the tunnel is interrupted and Forefront can inspect the traffic. When SSL is bridged, the user establishes a SSL connection with Forefront TMG and Forefront TMG establishes a SSL connection with Exchange. This means that the users still use SSL to access their e-mail, but Forefront TMG can inspect the network traffic. When the access to Exchange is secured by SSL, which is absolutely needed to have at least some basic protection, and only passed through the firewall to Exchange, these filters cannot work because all they see is the encrypted stream of bytes. It is completely hidden behind the firewall.įorefront also supports web filters and e-mail filters. From the Internet, nobody sees your Exchange Server. Here the protection mechanism is the same as with Preauthentication. Another security feature of Forefront is that it can act as a web proxy. This improves security in various ways one of them is that you do not have to publish Exchange to the internet. Forefront then passes the privileges to the Exchange Server. Forefront supports Preauthentication, which means the users do not authenticate with the Exchange Server but with Forefront. However, this approach undermines most of the security features of Forefront TMG. I often see that Exchange 2010 is published directly to the internet by allowing access to the various ports from the internet.