Recently I had to get an old ASP application working in IIS 7.5 on a W2K8 server. Almost everything works fine, except that I can\'t seem to get it to accept uploads larger
The solution accepted here didn't work for me. First, there wasn't the element specified in my config and I didn't want to screw up a config file.
I also tried @shoaib-suleman's solution and it didn't work either. Finally, I ran across the solution shown here and it worked.
Open IIS 7 SnapIn
Select the website you want enable to accept large file uploads.
In the main window double click 'Request filtering'
Once the window is opened you may see on top a list of tabs eg: file name extensions, rules, hidden segments and so on...
Regardless the tab you select, in the main window,right-click to display a pop-up context menu. Select "Edit Feature Settings" in the menu.
On the form that pops up, modify the "Maximum allowed content length (bytes)"