From this post, you will get three efficient solutions to fix this error.

you might get more information about Dropbox by clickingMiniTool.

How to Fix Cant Establish Secure Connection Dropbox Error?

turn on Set time automatically and Set time zone automatically options

A large number of people said that they have met cant establish secure connection Dropbox error.

Then c’mon refer to the following solutions carefully to avoid causing other problems.

So if the two dates dont match, then the cant establish secure connection Dropbox error will occur.

click Allow an app through firewall

Step 1: OpenSettingsand clickTime & Languagein the Windows prefs window.

Step 2: SelectDate & timefrom the left side menu.

Step 3: check that that bothSet time automaticallyandSet time zone automaticallyoptions are turned on.

Most Effective Ways to Recover Deleted Files from Dropbox

Thus, you better add Dropbox to the whitelist of your antivirus software.

Step 1: EnterWindows Defenderin the search box next toCortanaand choose the best matched one to continue.

Step 2: ClickFirewall & web link protectionto open a new window.

Step 3: ClickAllow an app through firewallto open a new window.

Step 4: ClickChange settingsand find theDropboxfrom the list.

Step 5: CheckPrivateandPublicfor this app and then clickOKto save and apply the changes.

Here is the method.

Step 1: Click theDropboxicon inside your system tray and then clickPreferences.

Step 2: ClickNetworkunderProxy Settingssection to check that you have set proxy options correctly.

Do you want to recover deleted files from Dropbox?

Focusing on different situations, the solutions are various.

Now, read this post to learn these solutions.

Hope this article can help you.