How to configure a firewall to work with Dropbox

Usually no firewall configuration is needed to run the Dropbox desktop app. If your web browser has an internet connection, the desktop app should be able to use the same connection.

However, if sync isn’t working, adjust your firewall settings to permit the desktop app internet access. Usually, adding Dropbox to a list of applications with internet access resolves the issue.

Each brand of firewall software works differently depending on the manufacturer. Refer to your firewall software documentation for specific directions. In general, you may need to do the following:

  • Allow Dropbox access to ports 80 (HTTP) and 443 (HTTPS)
  • The Open button requires access to ports 17600 and 17603.
  • The LAN Sync feature requires access to port 17500 (recommended).
  • Add to the list of approved websites for your firewall, and make sure that it isn’t blacklisted.
  • Allow *.dropbox and other Dropbox domains to access the internet.

Learn more about the domains officially used by Dropbox.


Dropbox supports most proxies. If you use a proxy to access the internet, you can specify your proxy settings within Dropbox desktop app preferences.

Learn how to use a proxy with Dropbox.

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