+1 to John's point and your initial troubleshooting approach. Try adjusting the Web.config of the Session Preview (OData) webservice again--maybe double it until it works and/or confirm how much content (and maybe multimedia) is used by that page. Or try a smaller page. :-) This [StackOverflow post points out two settings][1], one for ASP.NET and another for IIS 7; multiple users also point out the difference in measurement unit (KB for .NET, but bytes for the IIS setting). http://msdn.microsoft.com/en-us/library/e1f13641(v=vs.100).aspx <configuration> <system.web> <httpRuntime maxRequestLength="size-in-KB" /> </system.web> </configuration> But also: http://msdn.microsoft.com/en-us/library/ms689462%28VS.90%29.aspx <system.webServer> <security> <requestFiltering> <requestLimits maxAllowedContentLength="size-in-bytes" /> </requestFiltering> </security> </system.webServer> Maybe someone else can fill in the details of what gets sent to Session Preview storage. I'm guessing it's the session-specific page, component presentations, and multimedia but haven't checked to be sure. [1]: http://stackoverflow.com/questions/3853767/maximum-request-length-exceeded