Applications or services that use sockets may stop responding in Windows Server 2008 or Windows Vista SP1
In Windows Server 2008 or Windows Vista SP1, applications or services that use sockets may stop responding.
For example, a Windows Server 2008-based domain controller randomly becomes unresponsive to LDAP requests. After this issue occurs, you have to restart the server.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB959816.