Instant Messaging

Indicate Which IP Addresses are Behind a Firewall

When an Instant Messaging router receives a message, it determines whether the IP address of the client sending the message is inside or outside the corporate network. If the message originates from a local IP address (that is, from inside the corporate firewall), the server refers the message. If the message originates from the Internet (that is, from outside the corporate firewall), the server sends the message through a gateway.

Note   Firewall settings only apply to your company if it is protected by a firewall and you want Instant Messaging connectivity to the Internet. If you are installing a test deployment or an internal-only deployment, no action is necessary.

To identify which IP addresses are protected by your corporate firewall:

  1. Start System Manager
    On the Start menu, point to Programs, point to Microsoft Exchange, and then click System Manager.
  2. Navigate to Instant Messaging Settings.

    Global Settings

    1. Instant Messaging Settings
  3. Right-click Instant Messaging Settings, and then click Properties.
  4. On the Firewall Topology tab, click This network is protected by a firewall.
  5. Click Add.
  6. Type the first and last IP address in the range in From and To, respectively, and then click OK.
  7. Repeat the previous two steps to add additional IP address ranges.

Related Topics

Use a Proxy Server for Outbound Messages