1) Open a command prompt and make sure you are in the X:\Inetpub\Adminscripts folder (where X is the IIS installation drive).
2) From that folder run:
cscript adsutil.vbs set w3svc/disablesocketpooling true
The command replies as follows:
disablesocketpooling : (BOOLEAN) True
3) Restart the IIS Admin service.
For help to disable socket pooling with IIS 6 see: Disable socket pooling on IIS6