By default in IIS 7 requestFiltering has the MaxAllowedContentLength property enabled. It specifies, in bytes, the maximum length of the content in a request. The default is 30,000,000 (approximately 30 megabytes.) To change this value you must edit the following file: %windir%\System32\inetsrv\config\applicationHost.config.
Modify the following code.
<requestLimits maxAllowedContentLength ="10000000" />
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