ReportViewer timeouts in spite of timeout settings

Question

I have an ASP.NET app that exposes a Microsoft ReportViewer (actually an MVC3 app with one WebForm hosting the ReportViewer). When running large reports, a timeout occurs causi

Answer 1

We had the exact same problem and in addition to changing the ScriptManager AsyncPostBackTimeout from the default of 90 seconds to a bigger value like 600 (10 minutes), we also had to change the Amazon ELB load balancer settings from 1 minute to 10 minutes. That worked for us.