In short, in a certain network, users get their downloads from cloud storage providers interrupted - it invariably hangs when using Dropbox, and downloads from other providers too. (OneDrive seems to be an exception, curiously enough.) There’s no error message or anything, it just stops after a few MBs. It doesn’t matter which browser I use.
I’ve been working hard with the firewall but i doesn’t matter whatever I temporarily turn off. It’s not a Windows Server issue, because downloads in general work fine.
I’m not an expert on such tools, but Fiddler for instance show nothing strange. There’s a connection, and all seems fine, but the download hangs.
I don’t know how to troubleshoot this further. Somewhere there should be some indication of what it is that makes this happen (in browser or otherwise) – but I don’t know where to look. – The smallest hint is appreciated.
PS. I’ve been googling extensively, but haven’t had any hits on this particular scenario, but getting tons of “false positives”, so to speak.