Configuration step required for Sametime Community Server on Windows 2008

Without a special configuration step, various server applications log out from the Sametime Community server on Microsoft Windows 2008 under load

The steps bellow are from From TN 1441275

To resolve the problem perform the following steps
  1. The TCP stack in Windows 2008 has a few new features that are not yet supported by every
    hardware. The following configuration changes will set the TCP stack to work in a more "conventional" way.  To do so, type from command line:

        netsh int tcp set global autotuninglevel=disabled
        netsh int tcp set global rss=disabled
        netsh int tcp set global chimney=disabled
        netsh int tcp set global congestionprovider=none

    A reboot is needed after making this changes.
  2. For Sametime 8.5.1, set the following flag under the [Config] section of the sametime.ini file:
BREAK_CONN_ON_ZERO_BYTES_SENT=0

This setting is set automatically during install of 8.5.2 on Windows 2008.

For 8.5.0, a hotfix, LKRK-86RGNA, is available for part of the components: STCommunity, STMux, STOnlineDir, STUserStorage.  Open a service request with IBM Support to determine if this hotfix is applicable for your environment if you are not able to upgrade to 8.5.1 or later.