Forums talks about the possible solutions:
http://forums.iis.net/t/1169257.aspx?Request+Entity+Too+large+413+error+
One is to increase the size by running : Use appcmd.exe utility to set UploadReadAheadSize in applicationhost file. The size would be in KB.
Locate appcmd.exe in \windows\system32\inetsrv folder and run following command on command line tool
appcmd.exe set config -section:system.webserver/serverruntime/uploadreadaheadsize: 1048576 /commit:apphost
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