In the console tree of ISA Server Management, click
Expand Microsoft Internet Security and Acceleration
Server 2006, expand Arrays, expand
Array_Name, expand Configuration, and then
In the details pane, click the applicable server.
On the Tasks tab, click Configure Selected
On the General tab, in Host ID, click the
drop-down list and select one of the unallocated host IDs.
To open ISA Server Management, click Start, point to
All Programs, point to Microsoft ISA Server, and then
click ISA Server Management.
Manually restart the Microsoft Firewall service if it did not
restart after you modified the host ID to resolve a host ID
You may have to reconfigure the host IDs for a specific server,
due to a host ID conflict. Host ID conflicts may occur in the
In some export and import configurations, a host ID may be
automatically generated during the export. If this host ID causes a
conflict during the import, the import will succeed but the
Firewall service will not start, and an alert will be generated.
After the import, for more information, check Event Viewer.
When you run unattended setup, you can specify a HostID
property. If no value is specified, a host ID is automatically
assigned to the server. The host ID assignment during unattended
setup could result in conflicting host IDs. In this case, although
setup will complete, the Firewall service will not start, and an
alert will be generated. For more information, check Event