Large File Upload causing issue in IIS(" Default will be 30 mb ")

1. Modify the maxAllowedContentLength setting in the web.config

<system.webServer>

  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="2147483648" />
    </requestFiltering>
  </security>
</system.webServer>

                                  OR

2. Edit the request filtering feature settings and the request limits using IIS manager

1. Open IIS Manager.
2. Select the website that you want to configure.
3. Make sure you are in Features View per the button at the bottom of the manager.
4. Select Requests Filtering and open it by double-clicking the icon. The Request Filtering pane displays.
5. From the Actions pane on the right hand side of the screen click Edit Feature Settings... link. The Edit Request Filtering Settings window displays.
6. In the Request Limits section, enter the appropriate Maximum allowed content length (Bytes) and then click the OK button.
7. Restart IIS.