Dropbox Lan Sync

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  1. Dropbox Lan Sync Not Working
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  3. Dropbox Lan Sync Not Working

Dropbox is cloud-based file storage service. It is free to sign up, and provides web-based, desktop and mobile file sync applications. This article shows the ports used by Dropbox, and explains how to block or allow these ports on your computer network.

Follow below instructions to disable LAN Sync feature in Dropbox client. Connect to your VPS via Remote Desktop. Click on DropBox icon located at bottom right of the task bar. On the next screen, expand the gear icon and click on Preferences option. On the next screen, select the Bandwidth tab. There's a dropbox option called LAN sync that allows two clients on the same LAN to sync directly, that might be in use between two computers in the office? Dropbox does not constantly sync, it only syncs when it detects changes to files, so there are two possible reasons for it to be constantly generating traffic. The user put a whole lot. Dropbox seemed to be my best solution. A feature of Dropbox which most don’t know about is the “Enable LAN sync” option. This feature allows your files to sync over LAN to your other machines, it’s a hell of a lot faster, especially if you have a high speed router.

Ports used by Dropbox

Dropbox primarily uses ports TCP 80 and TCP 443.

It also uses TCP Port 7600 and TCP 17603 for the web-based “Open” button, and TCP Port 17500 for the LAN Sync feature. LAN Sync is different from the regular sync feature – it performs sync operations between computers on the same LAN and shouldn’t connect to the outside internet.

Dropbox Lan Sync Not Working

Dropbox does not require any public-facing open ports to operate. It initiates the outbound connections to the Dropbox server, and uses this for all communications.

How to Block Dropbox On Your Network

If you want to block Dropbox on your network, there are a few measures you can put in place:

Dropbox Lan Sync Protocol

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Dropbox Lan Sync Not Working

  1. Create local firewall rules using Windows Firewall to block Dropbox.exe and DropboxUpdate.exe
  2. Block the resolution of DNS records on the dropbox.com, dropboxapi.com, and dropboxusercontent.com domains. If you run your own DNS server (such as an Active Directory server) then this is easy:
    1. Open your DNS Management Console
    2. Create a top-level record for ‘dropbox.com‘ and the other domains mentioned above.
    3. Do nothing else. By pointing this record nowhere you will stop connections to this domain and all of it’s subdomains
  3. Ensure the only DNS connections allowed on your network are to your own internal DNS servers (which contain the above dummy-record). This removes the possibility of the TeamViewer client checking DNS records against their own servers, instead of yours.To do so, add a new outgoing firewall rule to disallow TCP & UDP port 53 from all source IP addresses, EXCEPT the addresses of your own DNS servers.
  4. Block access to the Dropbox IP Address Ranges. You can check the list of assigned addresses on the ARIN website, and add these ad DENY rules in your firewall.
  5. You can utilise Group Policy to deny Dropbox.exe from running. To do this, create a new Software Restriction Policy with a Hash Rule for Dropbox.exe.
  6. Finally, if you have a firewall with Deep Packet Exception, you can enable the in-built rules to block Dropbox. These firewalls often release new definition updates as the situation changes, so a lot of the hard work is handled for you.