All the TCP/IP ports that are in a TIME_WAIT status are not closed after 497 days from system startup in Windows Vista and in Windows Server 2008
On a computer that is running Windows Vista or Windows Server 2008, all the TCP/IP ports that are in a TIME_WAIT status are not closed after 497 days from system startup. Therefore, TCP/IP ports may be exhausted, and new TCP/IP sessions may not be created.
Note: Some network-related operations to this computer may be affected by this issue. For example, you try to use some remote administration tools to manage a Windows Server 2008-based domain controller that has been running for more than 497 days. In this example, the remote administration tools cannot connect to the domain controller.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2553549.