i try to block the Dropbox Installation File download.
Therefore i created a file filtering rule to deny Windows Executable Files.
All files like TeamViewer.exe or putty.exe are blocked by the Rule.
But the Dropbox.exe can be downloaded. How can i prevent that?
I tested Downloads from http://www.7-zip.de/download.html.
The EXE-Files are blocked.
MSI Files are detected as File Type "File-HTML" or "File_Microsoft-OLE" (i can see this in log) and are allowed.
Dropbox.com uses HTTPS, if you wish to inspect and block something in those connections you must decrypt the HTTPS connections. Please see the TLS Inspection section in product guide for configuration steps (p.947 in 5.10 guide).