Hello, It's seems the issue from https://github.com/InteractiveAdvertisingBureau/VAST_Samples/issues/10#issue-295350709 is back. VAST samples mediafiles are not accessible (access denied) when requested. https://github.com/InteractiveAdvertisingBureau/VAST_Samples/blob/master/VAST%204.2%20Samples/Inline_Simple.xml - https://iab-publicfiles.s3.amazonaws.com/vast/VAST-4.0-Short-Intro.mp4 - https://iab-publicfiles.s3.amazonaws.com/vast/VAST-4.0-Short-Intro-mid-resolution.mp4 - https://iab-publicfiles.s3.amazonaws.com/vast/VAST-4.0-Short-Intro-low-resolution.mp4 
Hello,
It's seems the issue from #10 (comment) is back.
VAST samples mediafiles are not accessible (access denied) when requested.
https://github.com/InteractiveAdvertisingBureau/VAST_Samples/blob/master/VAST%204.2%20Samples/Inline_Simple.xml