TCP Window sizing not working as expected for Windows server 2008 R2 SP1

Hi ,
TCP window size is not working as expected. It is varying . Aplied the hotfix suggested by Microsoft and set the multipliccation factor as 1.The window size is not getting auto tuned based on the client machine. The data transfer rate is getting degraded.
Please help.

I think window auto-tuning is enabled.
You can disable it by running the following commend.
netsh interface tcp set global autotuninglevel=disabled
Hope this helps.

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