SOLVED: VPN blocked by Java security on PC

Ivan Jenic
by Ivan Jenic
Troubleshooting Expert
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  • Java provides an API that secure network settings for its users called Java security.
  • Unfortunately, Java security has a habit of blocking VPNs, and we will be looking over several solutions to that particular issue.
  • If you want to know more about this program, head over to our dedicated Java Hub.
  • If you are looking for VPN-related content, check out our VPN How-to page.
java security blocked VPN

Is your VPN blocked by Java security? Are you having issues accessing some websites while on VPN? Do not panic! Windows Report will show you how to bypass this problem.

Many users reported that after the installation of their VPN client as well the required components, their VPN software got blocked by Java security.

Meanwhile, when they attempt to connect their VPN, they get the ‘Application blocked by Java Security’ prompt. Therefore, we have enlisted the best workarounds to solve the VPN blocked by Java security problem.


FIX: Java Security blocked VPN

  1. Use a better VPN software
  2. Add an exception in Java
  3. Clear Java cache
  4. Reinstall your VPN
  5. Clear web browser cache/Flush DNS
  6. Install Windows updates
  7. Reinstall Java

1. Use a better VPN software

The best VPNs in the world are designed to also be able to work around common obstacles such as Java security blockages.

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2. Add an exception in Java

Sometimes, VPN users get blocked within web browsers such as IE, Mozilla Firefox, Google Chrome, etc most especially when they want to access Java web contents; therefore, it is necessary to add such websites to the exception list in Java.

Here’s how to do this in Java‘s Control Panel:

  • Go to Start> type Java control panel and hit Enter’ key.
    • Alternatively, double-click on the Java icon at the taskbar to get the Java control panel dialog box.
  • Now, go to the Security tab.
    • If the Security Level is set to Very High, reduce it to High.
  • Click on the Edit Site List button
  • Click Add to type in the site URL.
  • In the highlighted line, type the URL, and then click the OK button.
  • After launching your web browser and attempting the URL, the Do you trust prompt will come up, tick the Always trust boxes, and then click OK.

Note: If Java control panel dashboard did not come up, that means Java is incorrectly setup on your Windows PC. (Solution 7-how to setup Java).


3. Clear Java cache

Another way of fixing VPN blocked by Java security problems is by clearing Java cache.

Here’s how to clear Java cache:

  • Go to Start> type Java control panel and hit Enter key
  • Navigate to the General tab, and click Settings under the temporary internet files section.
  • Click Delete Files on the temporary files settings dialog box
  • Click OK on the Delete Files and Applications prompt and follow the prompts.
  • Afterwards, launch your VPN.

Alternatively, you can also use tools such as CCleaner, Ashampoo Win Optimizer and IOLO System Mechanic to clear Java cache. However, if the VPN is still blocked by Java security, then you may have to proceed to the next solution.


4. Reinstall your VPN

Sometimes, your VPN client software may be installed incorrectly; therefore, you may have to reinstall it.

Here’s how to do this:

  • Go to Start > Control Panel vpn blocked by java security
  • Select Uninstall a program under Programs menuvpn blocked by java security
  • Find your VPN from the list of programs and select Uninstallvpn blocked by java security
  • In the Setup Wizard, click you’ll get a notification after a successful uninstall, so click Close to exit the wizard.
  • Alternatively, use IObit Uninstaller Pro (suggested) or any other third-party uninstaller to clean all software leftovers and registry entries the VPN has made.
  • Restart your PC.
  • Download the latest version of the VPN of your choice (CyberGhostVPN is our choice) and install it.

5. Clear web browser cache/Flush DNS

Some VPN users reported success in fixing the VPN blocked by Java security simply by clearing their web browser cache.

Meanwhile, DNS entries from your Internet Service Provider may be wrong. So, you need to flush the DNS and clear your web browser’s cache subsequently.

Here’s how to do this:

5.1. Flush the DNS

  • Go to Start > Type command prompt
  • Right-click “Start” and select Command Prompt (Admin)
  • Type ipconfig /flushdns and press Enter.
    • You should get a confirmation that says: Windows IP Configuration Successfully flushed the DNS Resolver Cachevpn blocked by java security

5.2. Clear Web Browser Cache

  • Launch your web browser e.g. Microsoft Edge
  • Press Ctrl + Shift + Delete to access the Clear recent history dialog box.vpn blocked by java security
  • Under the Time range to clear drop-down menu, select Everything.
  • Make sure to check the Cache box.
    • Click on Clear Now

Note: Ctrl + Shift + Delete can also be used to clear cache on other web browsers such as Internet Explorer, Opera, Google Chrome, Microsoft Edge, Mozilla Firefox, etc.


6. Install Windows updates

Latest Windows updates improve the system’s stability and fix various issues you may encounter, and especially the situation where your VPN got blocked by Java security.

Nevertheless, you can follow these steps to update your Windows OS:

  1. Go to Start>type windows update in the search box and then click on Windows Update to proceed.
  2. In the Windows Update window, check for updates and install the available updates.vpn blocked by java security
  3. After the update is complete, restart your Windows PC.

7. Reinstall Java

Meanwhile, Java may have been installed incorrectly on your Windows PC. Therefore, in order to bypass the VPN blocked by Java security problem, you may have to uninstall Java from your Windows PC.

Here’s how to uninstall Java from control panel:

  • Go to Start > Programs and features. Or, Go to Start > Control Panel > Uninstall a programvpn blocked by java security
  • In the list of installed programs, select all Java related programs, and then click the uninstall menu.
  • Follow the prompts to complete uninstall process

Alternatively, you can use uninstaller programs such as IOBit Uninstaller, Revo Uninstaller, and Ashampoo Uninstaller to uninstall Java and remove its leftovers from your Windows PC.

However, because Java is required by some applications, then you have to reinstall Java on your Windows machine. For this purpose, you may have to check our guide so as to install Java afresh.

Hope this would help solve VPN blocked by Java security issue. However, feel free to share your experience with us in the comments section or go to the VPN section for more information about VPN.


FAQ: Learn more about Java security

  • Is Java a security risk?

Java security can indeed be a risk if it is the only thing you rely on, mostly because users tend to never update it whenever something new becomes available.

  • Where is the Java security file?

Depending on whether you chose the default location for installation, the Java security file can be in one of these two locations:

  1. C:/Program Files/APCPowerChute Business Edition
  2. C:/Program Files (x86)/APCPowerChute Business Edition
  • Is Java the only thing that can block my VPN?

No, there are numerous reasons why a VPN may not work on your PC. Check out this article for the most common reason why your VPN may not connect.


Editor’s Note: This post was originally published in July 2018 and has been since revamped and updated in May 2020 for freshness, accuracy, and comprehensiveness.