http://blogs.msdn.com/b/sajay/archive/2009/07/21/servicethrottlingbehavior-defaults-for-net-4.aspxThis is one of the new updates that you will find with the .NET 4 installation. This was a decision we reached after understanding the fact that almost all customers had to bump this number up to a sweet spot of around 100 sessions. However the initialen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/sajay/archive/2009/07/21/servicethrottlingbehavior-defaults-for-net-4.aspx#10289350Fri, 30 Mar 2012 11:15:50 GMT91d46819-8472-40ad-a661-2c78acb4018c:10289350Manivannan.P<p>The MSDN doc for .NET 4 shows different default values. But the 4.5 Version shows your default values. Where is the problem ?</p> <p><a rel="nofollow" target="_new" href="http://msdn.microsoft.com/en-us/library/system.servicemodel.description.servicethrottlingbehavior.maxconcurrentsessions(v=vs.100).aspx">msdn.microsoft.com/.../system.servicemodel.description.servicethrottlingbehavior.maxconcurrentsessions(v=vs.100).aspx</a></p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10289350" width="1" height="1">