SharePoint 2007: Increase the maximum upload limit on SharePoint web application

Increasing the maximum upload limit for a SharePoint site collection can be configured on the Central Administration. But sometimes it is not enough, you might need to increase some time out configurations.
So you must consider:
   1. Configure in Central Administration
   2. Configure Time outs:
      2.1 IIS  
      2.2 Web.config

1. Configure in Central Administration
   1. Open the Central Administration>
   2. Go to "Application Management" , then ""Web Application General Settings"
   3. Make sure you selected the correct web application and modify the "Maximum Upload Size" field.

2. Time Outs
   2.1  IIS
         1. Open IIS, select the website and open its properties. 
       2. Open the "Web Site" tab. Set the value in "Connection timeout" field (see image below).
       3. You should consider 120 seconds per extra 50MB upload.

   2.2 Web.config
         1. Edit C:\Program Files\Common Files\Microsoft Shared\Web server extensions\12\TEMPLATE\LAYOUTS\web.config
               1.1 add or change the following "ExecutionTimeout" property to the value shown:

         2. Edit the web.config of your Web application.
                2.1 add or change the following "ExecutionTimeout" property to the value shown: