Thanks for checking in with us on the Dropbox Forum on this connection message, I hope you’re doing well today & I’d like to wish you a wonderful May ahead!
If I were in your shoes, I’d first check if this is just a network issue, so I’d try to load the Dropbox website & reset my router if I was unable to access Dropbox in both places.
Following, could you make sure that you’ve selected No proxy on your proxy settings? Also, can you make sure you've configured your firewall to work with Dropbox if you’re on a working environment and that the domains listed here are allowed or whitelisted?
Last but not least, I’d suggest disabling any Security/Antivirus programs & giving our offline installer a try (based on your OS):
Once you do, please keep me updated on your results in your next post (I’d also appreciate any visuals or additional troubleshooting you’ve done on your own), so that we work on that together as closely as possible. Thanks again & I’m looking forward to hearing back from you on this discussion!
