Symptom(s):

Users may experience slow network performance under Windows Server 2008*.

Cause:

Windows Server 2008* has a TCP window scaling feature. The operating system can adjust the TCP receive window size to maximize the network performance. However, some old routers, firewalls and operating systems that are incompatible with the window scaling feature may cause slow data transfer or lost of connectivity.

Solution:

1. Make sure your router, firewall and client operating system can support TCP window scaling.
2. Check with the network device manufacturer if a firmware update is available to support TCP window scaling.
3. If the issue still persists, disable the TCP window scaling feature on Windows Server 2008* by running the following command:
   netsh interface tcp set global autotuninglevel=disabled

Please refer to the following Microsoft* KB articles for more information:
http://support.microsoft.com/kb/929868
http://support.microsoft.com/kb/932170
http://support.microsoft.com/kb/935400

Operating System:

Windows Server 2008*

This applies to:

Intel® Server Board S3200SH Intel® Server Board S5000PAL Intel® Server Board S5000PSL Intel® Server Board S5000VCL Intel® Server Board S5000VSA Intel® Server Board S5000XAL Intel® Server Board S5000XSL Intel® Server Board S5400SF Intel® Server Board S5500BC Intel® Server Board S5500HCV Intel® Server Board S5500HV Intel® Server Board S5500WB Intel® Server Board S5520HC Intel® Server Board S5520UR Intel® Server System SC5400RA Intel® Server System SR1530CL Intel® Server System SR1530HCL Intel® Server System SR1530HCLS Intel® Server System SR1530SH Intel® Server System SR1560SF Intel® Server System SR1600UR Intel® Server System SR1600URHS Intel® Server System SR1625UR Intel® Server System SR1625URSAS Intel® Server System SR1630BC Intel® Server System SR1670HV Intel® Server System SR1680MV Intel® Server System SR2520SA Intel® Server System SR2600UR Intel® Server System SR2600URBRP Intel® Server System SR2600URLX Intel® Server System SR2625UR Intel® Server System SR2625URBRP Intel® Server System SR2625URLX Intel® Workstation Board S5000XVN Intel® Workstation Board S5520SC