If your shared links have stopped working, and you've ruled out other causes, your links may have been banned for one of the reasons detailed below. When your links are banned, you can't share them, but the files are still available to you in your Dropbox.
Links are automatically banned if they generate unusually large amounts of traffic.
Dropbox Basic (free) accounts:If your account hits our limit, we'll send a message to the email address registered to your account. Your links will be temporarily disabled, and anyone who tries to access them will see an error page instead of your files.
Even with a traffic limit of 20 GB or 200 GB per day, or 100,000 downloads per day, it's entirely possible for links to go over the limit. Let's say you've sent a link to a file to a small number of people. One of the recipients could have sent the link to others, leading to more people viewing the file and using up the allotted traffic. Or one of the recipients could have downloaded the file multiple times; each download is counted separately for tracking purposes. If you publish your link on social media, it may quickly spread to a very large audience with or without your knowledge.
Dropbox Pro and Dropbox for Business users: You may be able to reduce traffic to your links by setting passwords and expirations for them.
Unfortunately, we're not able to provide details on which of your links contributed most to your account going over the limit, or how much traffic each link generated.
We occasionally receive reports at abuse@dropbox.com that a shared link violates our Acceptable Use Policy. If we find a violation, all links and sharing will be banned for that account. If you think your links have been suspended incorrectly for this reason, contact our support team and we'll take a look.
