Increase IIS Maximum Connection Limit
This can be bumped up to 40 but not higher (40 is the hardcoded limit). Default value is 10 connection.
To do this, find the adsutil.vbs script (should be in c:\inetpub\AdminScripts or similar) and run the following command:
adsutil set w3svc/MaxConnections 40
Note: If you dont have AdminScripts, you can copy your machine’s AdminScripts folder to the server and use the above command.