Same issue on all my work computers. All running updated Eset and Dropbox.
If I disable SSL : Dropbox App works
If I re-enable SSL : Dropbox App with not secure connection
If I used SSL interactive mode : I tell Eset to allow "Dropbox" and it does not work (no secure connection)
If I turn off "HTTP Protocol Checking" : Dropbox App works (but a terrible solution)
I Will be monitoring this thread to see if anything else works. I suck at making system rules for firewall but I have been trying that as well.
Thank you