I'm running PanOS 9.0 on a PA220 and noticed a couple days ago that Amazon Prime Video wasn't playing on any of my wireless devices. However, it would play on a desktop or laptop through Firefox. After a few troubleshooting steps and Google, it seemed to me the difference was in the actual player itself. I enabled "Allow HTTP partial response" in the content-ID and everything started working. I'm not sure if this is a bug or not, but I think it's probably working as designed. This option prevents a client from resuming download of a malware file if the firewall stops the download, so it is unfortunate that it needs to be enabled for this to work.
Due to certain options, such kinds of errors creep up. However, you have found a solution to your problem as you weren't the first or the only person to face this problem.
I know this post is a little on the old side, but i wanted to say thank you for posting this. I knew there was a firewall-like setting somewhere that was blocking this.
This same setting was blocking all machines from downloading and installing Blizzards Battle.net and any updates to games within it if it was already installed. The errors were indicating there was no connection to the update servers, yet in a browser i could grab all the files the logs were erroring on. It turns out the battle.net installer, which also runs the updates to all games, uses this function as well.
I would like to see this setting somewhat configurable though i.e. allow an exclusion list with src/dest/app etc options.
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