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Sometimes Secure Connection in Mozilla Firefox Failed, due to some technical issues. Mozilla Firefox is one of the best web browsers with the largest user base after Google Chrome, Safari, and Edge. Based on the Gecko Browser Engine, Firefox is open-source software available to everyone for free. One of the best features which are common among various web browsers is the multiple tabs option and the compatibility to add different extensions in the browser along with other security features. All these features are present in Mozilla Firefox, which keeps it on the list of the largest web browsers.

How to Fix 403 Forbidden Error on Mozilla Firefox?

However, sometimes, due to security concerns, users face issues while accessing a webpage in which a browser displays the message “Secure Connection Failed” or “Did Not Connect: Potential Security Issue.” Although it can be a security concern that could compromise the security of their system, users still want to load the webpage. For those users, we will provide all the available information on the Mozilla Firefox “Secure Connection Failed” error apart from various measures on how to fix it. Read the article further to fix Mozilla Secure Connection Failed Issue.

Why does the Firefox “Secure Connection Failed” Message

The main common cause for this error is the issue with the website certificates. Transport Layer Security Certificates are electronic certificates/documents through which any browser can verify the identity and prove the validity of the websites. These TLS certificates are particularly used by the website whose addresses consist of “HTTPS.” Through the TLS certificate, a secure and encrypted connection is established between the browser and the website. However, sometimes, when Mozilla Firefox is unable to verify the security certificates, they display the following message:

Firefox Secure Connection Failed
Did Not Connect: Potential Security Issue

Causes of Failed Secure Connection in Firefox

Some of the common cause why the browser is unable to verify the TLS certificates are listed below:

The TLS certificates for the websites are outdated and, thus, no longer secure because they are restricted by Mozilla Firefox.
Because of the HTTP Strict Transport Security (HSTS), the website does not allow the website to have access because of an insecure connection.
Any Antivirus may restrict the loading of the webpage: Due to security concerns with the website, the Antivirus installed in your system will stop the browser from opening that page, thus displaying the “Secure Connection Failed” message.
Incorrect Date and Time in the system: Sometimes due to incorrect time and date settings in your computer, the browser is unable to verify the security certificates and thus loads errors while displaying the webpage.

How to Fix Mozilla Firefox Secure Connection Failed Issue

Various methods to establish a secure connection in Firefox can be taken, some of which are listed below:

1. Change your Mozilla Firefox Settings

SSL role in secure connection is crucial, due to which the Firefox Secure Connection Failed error may appear on the screen. It can be avoided by changing the Firefox browser settings, which are discussed below:

Reset the Firefox Secure Socket Layer (SSL) settings
Launch the Firefox Mozilla browser, and there, in the top-right corner, open the menu from which you can find the Help option. Click on it.
In the Help menu, select “More Troubleshooting Information.”
On the new page, you can find the option “Refresh Firefox” under the section “Give Firefox a Tune-Up.”
A pop-up will appear on the screen, which will provide a warning message that refreshing Firefox will clear all the Firefox Data. Click on “Refresh Firefox.”
Now the browser has been restored to the default settings. Try to open the webpage again from which you are encountering the Secure Connection Failed message.

2. Impair the DNS Settings in Firefox.

While opening any webpage, the browser sends the Domain Name Server request in order to verify that the website you are visiting is safe and secure and does not contain any malware file which might damage your system or keep your data at risk. However, due to DNS requests, the user is unable to access any website as it might be safe to access. In case the cause for the “Secure Connection Failed” error is For the DNS request, then you might disable the DNS settings for which the steps are listed below:

Click on the menu option in the top-right corner of Mozilla Firefox. Now from that, open settings.
Under the settings, navigate to the option “Network Settings.” There you can find an option marked as “Enable DNS over HTTPS” with a check box near it.
Remove the tick mark from that checkbox and then click Okay to make changes.
Now try to launch the webpage again, from which you are getting trouble.

3. Disable the Antivirus Software.

As the reason to block any webpage loading in your system is a security concern, there might be a possibility that the Antivirus you are using in your system has detected malware or virus files and thus restricted that webpage from loading on the browser. To override this cause, you need to disable the Antivirus on your computer temporarily.

Change the SSL Setting in your Mozilla Firefox Web Browser
You can also change the SSL Setting in your Mozilla web browser from the steps given below:

Open the Mozilla Firefox Web Browser, and in the address bar, type “about:config.” Once you have clicked enter, a pop-up will appear on the screen with the message “This might void your warranty.”
Click on the option “I accept the risk.”
Now in the search box, type “security.ssl.enable_ocsp_stapling,” and then in the result, select the Value to False, which will disable SSL security from the web browser.
Now open the page you were trying to load earlier.

4. Change the Proxy Server Settings

You need to change the proxy settings in the Firefox browser. To do that, you need to navigate to the upper right corner of the Firefox Browser and then, open the menu, and after that, follow the given steps:

Select the “Tool” option.
Now click on the “Option” and then select “Advanced.” This will open a new page, and you need to go to the “Network” tab.
Select the “Settings” icon, after which a new pop-up will appear on the screen Title “Connection Settings’.
Here you need to tick the check box next to the option Manual Proxy Connection.
After that, check for other details and then press OK.

5. Disable the Add-ons on Firefox and Correct the Date and Time on your Computer

You need to disable the other Add-ons and delete the extensions on your system through which there can be a security issue to your system. Apart from that, you need to correct the data and time in your system. You can easily do that by typing the date and time in the search menu of your Windows, after which you can change the date and time.

Reach Out to Us to Troubleshoot Mozilla Firefox Issues.

From the above discussion, we can hope that now you can easily override the secure connection that failed in your system. However, in case you still need assistance, you can reach out to our technical support service. You can contact us by dialling +1-855-362-0770, through which you will connect instantly to our customer support expert, who can resolve your issues. Also, we provide assistance to fix any issues not only with Mozilla Firefox. You can reach us through the live chat with your query, to which we will revert immediately.

When browsing the internet on your Mozilla Firefox browser, you may encounter various error codes that prevent you from accessing certain websites or pages. One such error is the 403 Forbidden Error, which indicates that you don’t have sufficient permissions to access the requested resource. If you are also facing this error and need to fix it, reading this post until the end can help. It elaborates on some handy solutions that can eliminate forbidden error 403 on Mozilla Firefox. Let’s explore!

Fix Secure Connection Failed Error

Possible Reasons Behind The Arrival of 403 Forbidden Error on Mozilla Firefox

The 403 Forbidden Error on Mozilla Firefox can occur for a variety of reasons. Some of the most common reasons that can bring forth this error are mentioned in the below-given list:

Incorrect permissions: The website you are trying to access may have incorrect permissions configured for the resource you are trying to access. This can happen if the website owner has not set the permissions properly or has restricted access to certain users.

Authentication Issues: Sometimes, websites require you to log in before you can access certain resources. If you have not provided the correct user ID/Password or the website’s authentication system is not working properly, you may receive a 403 Forbidden Error.

Blocked IP Addresses: Some websites block access to their resources from certain IP addresses or ranges. If your IP address has been blocked by the website, you will not be able to access the resource and will receive a 403 error.

Misconfigured Security Settings: 403 error is also the reason of Misconfiguration of Website’s Security Setting This can happen if the website owner has made changes to the security settings without fully understanding the implications of those changes.

Malware or viruses: If Malware or Viruses infects your computer, you may face 403 forbidden error. This can happen if the malware or virus is trying to gain unauthorized access to the website’s resources.

How To Eradicate Rid Of 403 Forbidden Error Using Simple Steps?

Now that you are aware of the possible reasons behind the arrival of the error, below are some tried and tested solutions that can help you in the error resolution:

First Solution: Clear Cache and Cookies

First things first, you need to clear your browser’s cache and cookies, as it is one of the most apparent reasons behind the arrival of the error. This can help resolve any issues that may be causing the 403 error. Follow the below-listed steps carefully for the error resolution:

Firstly, you need to launch your Firefox browser to start the troubleshooting.
After that, go to the Firefox menu and select Options.
Now, you need to go to the Privacy & Security tab and click on Clear Data.
Select both cookies and site Data and cache of Web Content.
Next, you need to hit the Clear button to clear your cache and cookies on Firefox.

Alternatively, you can also get the cache cleared automatically by implementing the below-given steps:

Click on the menu button from within the browser and then select Settings.
After that, select Privacy & Security panel to navigate to the History section.
Now locate the drop-down list next to Firefox Will and choose Use custom settings for History.
Here, you need to mark the checkbox for “Clear history when Firefox closes”.
Next, click the Settings button, and it will open a new Window labelled “Settings for Clearing History”.
Now tick-mark the Cache option and avoid selecting the item you want to keep.
Moving ahead, click the OK button, and it will close the active Window.
In the end, close the about: preferences page and any changes you have made will be saved automatically.

Check if the Firefox error is resolved or not. If it shows up again, just move to the next solution.

Second Solution: Check the Entered URL

Sometimes, the incorrect URL may be the reason for 403 error. You need to cross-check and confirm that the entered URL is correct. If not, you can attempt to search the URL from within a search engine. Check if the URL is accessible or not. If you are still unable to resolve the error in Mozilla Firefox, move to the next troubleshooting solution.

Third Solution: Disable Extensions

Extensions can sometimes cause issues with browsing, so it’s worth disabling them to see if that resolves the 403 error. To do this:

When in your Firefox browser, go to the Firefox menu and then select Add-ons.
From there, you can disable individual extensions by clicking on the Disable button next to each one.

If the error still persists, check if disabling extensions can help in the error resolution.

Fourth Solution: Disable Proxy Server

If you are using a proxy server to access the internet, this could be the cause of the 403 error. To disable the proxy server:

Open Firefox in the first place, and then go to the Firefox menu and select Options.
Now, go to the General tab and scroll down to the Network Settings section.
Here, verify not to select the Proxy Option

In A Nutshell

403 Forbidden Error on Mozilla Firefox is an annoying issue to deal with. However, this post elaborates on some simple solutions that can help you with the error resolution. If you still can’t fix the error and need further assistance, you can connect with our help desk and get an immediate response from our trained professionals.

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How to Fix Secure Connection Failed Error in Firefox?