Firewall is killing the connection
va.net.SocketException: Connection reset
Those are caused by local/remote firewall.
From log I could tell that you have many many downloads going on and then abort because of *file already exists* I guess you've hit some sort of limits.
You should not increase max connections in such a situation.
Speed in browser is also slow? please compare speed graphs in taskmanager and don't compare shown speed in browser
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JD-Dev & Server-Admin
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