If you get an Error Code 15 or Error Code 16 while you are browsing the web and you notice that your access is blocked to a particular website, then read on as this post will guide you in resolving this problem. Both the Error Code 15 and Error Code 16 have the same message that states, “Access Denied: This request was blocked by the security rules”.

Note that the error depends on what kind of browser you are using, as well as the operating system and network that you are using. On the other hand, the fixes for this error are the same and there are a handful of them that you can check out just make sure to follow each one of them carefully.

The first thing you can try is to sync the Date and Time of your computer as wrong Date and Time settings is one of the most common causes of connection problems like the Error code 15 or Error code 16. This is because of the incompatibility between the SSL Certificate validation date and the System Clock. Thus, you have to sync your System Clock. Refer to the steps below to do so.

• Right click on the Taskbar and click on the Adjust Date and Time option.
• Next, click on the Sync Now button to synchronize the Date and Time with the Microsoft Servers.
• Now make sure that the Time Zone that’s set on the same page is correct.

Resetting the affected browser might help in fixing Error Code 15 or Error Code 16.

Mozilla Firefox

• Open Firefox and click the icon that looks like a three stacked lines located at the top-right section of the browser.
• Next, select the question mark icon from the drop-down menu.
• Then select “Troubleshooting information” from the slide-out menu.
• After that, click on the “Reset Firefox” button located at the top-right section of the newly opened web page.
• Now select “Reset Firefox” in the confirmation pop-up window that appears.

Google Chrome

• Open Google Chrome, then tap the Alt + F keys.
• After that, click on Settings.
• Next, scroll down until you see the Advanced option, once you see it, click on it.
• After clicking the Advanced option, go to the “Restore and clean up option and click on the “Restore settings to their original defaults” option to reset Google Chrome.
• Now restart Google Chrome.

Internet Explorer

• Launch Internet Explorer.
• Next, click the wrench icon for Settings.
• Then click Internet Options.
• After that, go to the Advanced tab.
• From there, click the Reset button. This will reset Internet Explorer’s settings to their default condition.
• Now click OK to save the changes made.

Firewall and antivirus programs are known to block files the instant it detects a threat to the system. However, there are some cases when it can also block a file even when it’s a safe one. Thus, your antivirus or firewall programs might be the reason why you can’t download anything on your Windows 10 computer. To isolate the issue, you need to temporarily disable both the Firewall and antivirus programs and then check if you can now download anything from the internet. Do not forget to enable them again as disabling them can leave your computer vulnerable to cyber threats.

You can also try to disable the Proxy server for your LAN to fix Error code 15 or Error code 16 especially if your computer was attacked by some malware or adware recently. In such cases, there is a chance that the malware or adware has changed your network settings in order to generate intrusive advertisements. Thus, you have to disable the proxy server and you can do that by following these steps:

• Tap the Win + R keys to open the Run dialog box.
• Then type “inetcpl.cpl” in the field and hit Enter to pull up the Internet Properties.
• After that, go to the Connections tab and select the LAN settings.
• From there. Uncheck the “Use a Proxy Server” option for your LAN and then make sure that the “Automatically detect settings” option is checked.

• Now click the OK and the Apply buttons.
• Restart your PC.

Note: If you are using a third party proxy service, you have to disable it.

If you are using a VPN application, there are times when it causes some issues like this error. If that’s the case, you can try to disable your VPN temporarily and see if the error is resolved or not and if turns out that your VPN is the culprit, you have to uninstall it and install a new one or its latest version. To uninstall it, follow the steps below.

• Tap the Win + R keys to open the Run dialog box
• Then type “appwiz.cpl” in the field and hit Enter to open the Programs and Features in Control Panel.
• From there, look for the VPN service you are using, select it and then click on Uninstall to remove it.

• After that, restart your computer and try to install the latest version of the program again. It should work now. If not, proceed to the next available option below.

Besides the not being able to open a website due to Error Code 15 or Error Code 16, if you have other system-related issues that need some fixing on your Windows 10 PC, there is a one-click solution known as Restoro you can try to fix them. This program is a useful tool that could repair corrupted registries and optimize your PC’s overall performance. Aside from that, it also cleans out your computer for any junk or corrupted files that help you eliminate any unwanted files from your system. This is basically a solution that’s within your grasp with just a click. It’s easy to use as it is user-friendly. For complete set of instructions in downloading and using it, refer to the steps below.

Perform a full system scan using Restoro. To do so, follow the instructions below.

1. Turn on your computer. If it’s already on, you have to reboot

2. After that, the BIOS screen will be displayed, but if Windows pops up instead, reboot your computer and try again. Once you’re on the BIOS screen, repeat pressing F8, by doing so the Advanced Option shows up.

3. To navigate the Advanced Option use the arrow keys and select Safe Mode with Networking then hit

4. Windows will now load the Safe Mode with Networking.

5. Press and hold both R key and Windows key.

6. If done correctly, the Windows Run Box will show up.

7. Type in the URL address in the Run dialog box and then tap Enter or click OK.

8. After that, it will download the program. Wait for the download to finish and then open the launcher to install the program.

9. Once the installation process is completed, run Restoro to perform a full system scan.

10. After the scan is completed click the “Fix, Clean & Optimize Now” button.