How do I increase the maxUrlLength property in the config in asp.net MVC 3?

As per Ashok's answer that would equate to:

<httpRuntime maxUrlLength="1024" relaxedUrlToFileSystemMapping="true"/>

within <system.web> section of the web.config.

Take a look at this post by Hanselman. Although this post is about accepting typically invalid characters in the URL he also mentions how to configure the length of the path and the query string

While we're in here, note that in ASP.NET 4 you can also change allowed path and queryString lengths:

<httpRuntime maxRequestPathLength="260" maxQueryStringLength="2048" />

I had this problem in a rest service I created using C# .net 4. I set the maxUrlLength variable, in the system.web section, of the Web.Config file.

<?xml version="1.0"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.0" />
    <httpRuntime maxUrlLength="2000"/>
  </system.web>
....