Installation guide

Alacritech Accelerator Users Guide: Microsoft Windows Edition 5-2
5.4 Installation Problems
This section covers errors and problems surrounding installation only. For other prob-
lems, please see the other sections in this chapter.
Problem
Solution
TCP Offload does
not work
TCP Chimney offload will not work with the following features:
 Windows Firewall (Windows XP enabled by Default)
 Internet Protocol security (IPsec)
 Internet Protocol Network Address Translation (IPNAT)
 Third-party firewalls
 NDIS 5.1 intermediate drivers
If any one of these features is turned on, TCP Chimney offload
will not work regardless of the registry settings. See Chapter 3
for instructions on disabling these features.
5.4.1 Disabling Windows Firewall to Enable TCP Offload
In Windows XP Professional and Windows Server 2003, it is necessary to disable
Windows Firewall/Internet Connection Sharing to activate the TCP Offload feature on
the Accelerators in your system.
Note: The Windows Firewall Service must be explicitly turned off before TCP
Chimney can function under Windows XP and Windows Server 2003.
Note: By default, the IP NAT and IPsec Policy Agent features are turned on
when certain components such as bridging and routing services are
enabled. Therefore, TCP Chimney will not function in such a scenario.
When the bridging and routing services are disabled, IPNAT is not turned
off. Therefore, TCP Chimney is not re-enabled.
The IP NAT and IPsec Policy Agent features must be explicitly turned off
before TCP Chimney can function.
To disable this feature, use the following procedure:
1. Start Computer Management - from the Start menu, right click My Computer
and select Manage.
2. Under Services and Applications, click on Services. On the right side, scroll
down and double click on Windows Firewall/Internet Connection Sharing
(ICS), select Disabled.