SymptomsWhen you try to upload file with size great than 30MB on "File Sharing" page you get error:
Unable to upload: internal WebDAV service error. Error code: 404. Contact the server administrator to resolve this problem.
CauseThe reason of the problem is that IIS7 has 30MB limit by default.
To fix this problem just add 'web.config' file in the root folder of the site that you chose in Panel "File Sharing" settings with content: