Add to the list of approved sites (white list) and make sure it is not on a black list. Allow "Dropbox" (or "Dropbox.exe") to access ports 80 (HTTP) and 443 (HTTPS). If you have an antivirus and/or firewall running, make sure you do the following: This Help Center article goes into detail of the latest known security problem interactions: If your date and time are correct please check other security applications. Incorrect date and time on your computer could also prevent Dropbox from getting a secure connection, please make this is not the case before checking anything else. Connection problems usually mean there is a proxy, firewall, antivirus or other type of security program in the way.
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