Server Too Busy in vs2012

Question

I\'ve got vs2010 and vs2012 installed side by side. If I open up our MVC site in vs2010 and run it using the development web server it works fine, if I do the same thing in vs2

Answer 1

I have had this problem for my ASP.Net solution as well. There were no solutions for this problem on Stack Overflow or anywhere else.

Setup:

Visual Studio 2013 (but I think it will also work for vs 2010/2012 ASP.Net web application IIS express setup).

Our production environment never had this problem because it was running on IIS.

I have tried a lot to fix it, but I found one specific solution. I set the delayNotificationTimeout to 20 seconds, instead of the default of 5, which was not enough for our solutions to conjure up everything it needed to successfully run.

<system.web>
    <httpRuntime maxRequestLength="104850" 
                 executionTimeout="600" 
                 enableVersionHeader="false" 
                 delayNotificationTimeout="20" />
</system.web>

Answer 2

I finally fixed the annoying "Server Too Busy" message from slowing my ASP.Net development.

According to the remarks on the httpRuntime.appRequestQueueLimit property:

When the number of requests queued exceeds the limit imposed by this setting, incoming requests will be rejected with a "503 - Server Too Busy" error.

The default value is 5000, which I randomly increased to 9000 which worked for me:

<system.web>
  <httpRuntime appRequestQueueLimit="9000"/>
</system.web>

If you'd like to check this setting at runtime (as well as DelayNotificationTimeout), I added the following code to my Default.aspx.cs Page_Load event based on this Stack Overflow question:

// Uncomment to debug "Server Too Busy" error message
Configuration config = WebConfigurationManager.OpenWebConfiguration("~");
object o = config.GetSection("system.web/httpRuntime");
HttpRuntimeSection section = o as HttpRuntimeSection;
Response.Write("DelayNotificationTimeout: " + section.DelayNotificationTimeout.ToString() + "<br>");
Response.Write("AppRequestQueueLimit: " + section.AppRequestQueueLimit.ToString() + "<br>");