I do not have this setup to test. But the first thing I heard about was an uploadlimit in IIS 8.5. I'd check into that.
https://www.google.com/search?q=IIS+8.5&ie=utf-8&oe=utf-8#q=IIS+8.5+upload+limit
rproffitt 2,701 https://5calls.org Moderator
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berserk commented: Excellent Advise, went straight for the issue! +3
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