Maybe someone had a similar problem.
We have a local sandblast appliance and SBA with SBA4B in Internet Explorer and Google Chrome.
We tried to download file using these browsers. All is working when we download file in the Chrome, and I can see connections with sandblast in the Wireshark. But when we try to download file in the IE, there are no connections with sandblast and downloading freezes.
How can we fix it? The client version is E80.87.