Windows server 2008 R2 Enterprise Service Pack 1 - TCP/IP Registry settings

I am facing the issue  while making TCP/IP connections. This issue is occuring sometimes and not usual.
No connection could be made because the target machine actively refused it 127.0.0.1:8056.
This issue is due to server has full backlog.
Questions - Where to check the server backlog for TCP/IP requests?
How to tune the TCP/IP requests? Do we need to add any registry settings? Impact of those settings?
Any help is really appreciated.

These ones may help.
http://blogs.msdn.com/b/sql_protocols/archive/2006/03/09/546852.aspx
http://support.microsoft.com/kb/328476
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows]
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

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