How to fix errors Can't Establish Secure Connection on Safari

It's annoying when ad trackers keep track of your browsing activities and content. Fortunately, Apple is checking websites that track behavior whether you click on the page or not. In addition, the latest version of Safari with Intelligent Tracking Protection 2.0 features to check and remove third-party cookies that monitor your browsing behavior.

That's why users using Safari see error messages while opening suspicious sites. If you have errors Can't Establish Secure Connection with frequently visited websites, read the following article to find out how to fix it.

1. Check valid certificate

To ensure you are accessing the correct website, click on the address bar to review the URL carefully and search for the green lock icon before the website address. If it turns gray, this could be a cleverly crafted phishing site with a logo and layout like the one you normally visit.

2. Delete browser history

Normally, the Clear Browser History option will delete the list of websites you visit. However, the latest version of Safari deletes relevant data such as cookies and corresponding web content. So you need to consider before doing this.

Step 1 . In Safari, click History from the menu option at the top of the window.

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Step 2 . From the drop-down menu next to Clear , select All History , then click Clear History .

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3. Uninstall suspicious extensions and plugins

Extension, plugins and add-ons help speed up the process of performing specific tasks with just one or two mouse clicks. However, installing too many utilities may affect Safari's performance. Therefore, you should delete the plugin or unwanted extension and not use it.

Step 1 . Click on the Safari menu and select Preferences .

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Step 2 . From the window that appears, click Extensions to see the list of installed extensions on Safari. Select the extension you want to uninstall and delete it.

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4. Unblock all cookies

Many users may accidentally click the box that appears just below Prevent cross-site tracking . If so, all cookies will be blocked.

Step 1 . Open Safari's Preferences and click Privacy .

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Step 2 . Click Manage Website Data to open a new window. From here, you can select and delete website cookies you no longer need.

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5. Check permissions

Some plugins perform blocking the content of some websites that currently have unsolicited popups and misleading ads with some code on it. If you believe this is a false-positive, you should check the rights to Content Blocker and other factors such as Location.

Step 1 . Click on the Safari menu and select Preferences . From the pop-up window, click on the Websites tab.

Step 2 . Click Content Blockers in the left pane and see if the specific element of the page you are visiting is blocked.

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6. Clear DNS cache

Sometimes, clearing DNS cache can fix many connectivity issues and website speed. This solution is quite simple, you just need to write the correct command.

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You need to exit Safari first, then launch the Terminal application on Mac and type the following command:

 sudo killall -HUP mDNSResponder 

You need to enter the admin password and press Enter . Now restart Safari to check if the problem has been fixed.

7. Install a firewall

Firewalls protect you from unwarranted requests aimed at stealing your data and resources. It is possible that some software implement strict firewall policies and prevent Safari from connecting to the Internet. You can check if the firewall has blocked Safari by following the steps below.

Step 1 . Press Command + Space key to launch the Spotlight Search search bar.

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Step 2 . Type firewall in Spotlight Search and press Enter .

Step 3 . Click the lock in the lower left corner, enter the system password and tap the Unclock button to make changes to the firewall settings, then click the Firewall Options button.

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Step 4 . In the Firewall Options window, make sure to uncheck Block all incoming connections .

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In addition, you should check whether Safari appears in the exception list and whether Allow incoming connections is enabled.

8. Synchronize system time

Although there are few cases when the system time on the Mac is displayed incorrectly, to be sure, you should try testing.

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Click on the Apple menu and select System Preferences . On the window that appears, click on Date & Time , then click Time Zone to check if the time is correct. If you want to make changes, you must click on the lock icon in the lower left corner and enter your macOS account password.

9. Delete all site data

Apple removed the Reset Safari button from the Yosemite update. However, we still have an easy way to achieve the goal like pressing the button above.

Step 1 . Launch Safari, click the Safari menu and select Preferences .

Step 2 . Click on the Privacy tab from the window that appears and then click the Manage Website Data button.

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Step 3. Wait for the pop-up window to show the list of websites. Now, you can delete the data of the selected site or all websites. You can click the Remove All button and clear the data.

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Do this with the first solution to Safari to its original state. You can exit Safari and relaunch it to see if the problem is resolved.

10. Use another browser

If the above ways do not fix the problem, you can consider some Safari replacement browsers like Chrome and Firefox.

If no solution mentioned above works, reinstalling macOS is the last solution.

I wish you all success!