SOLVED: VPN blocked by Java security on PC

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

Solution 1: 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 (this will enable you to add the website URL responsible for the … blocked by Java security)
  • 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).

Solution 2: Clear Java cache

Another way of fixing VPN blocked by Java security problem 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.

Solution 3: 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.

Solution 4: 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:

Step 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

Step 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.

Solution 5: 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.

Solution 6: Use a better VPN software

Some excellent VPN providers such as CyberGhost, NordVPN, and Hotspot Shield VPN are Java-compliant; therefore, Windows users don’t experience VPN blocked by Java security by using them.


CyberGhost gives you access to more than 3000 servers worldwide. With features like highest possible speed, unlimited bandwidth and traffic, DNS and IP Leak protection, strict no logs policy, 256-bit AES encryption; this makes it possible to surf the internet anonymously with no worries about your privacy.

Meanwhile, this VPN gives you simultaneous connections on up to 7 devices. Also, they have applications for Windows OS and other platforms as well. So, if you are looking for a VPN that does not have issues like ‘VPN blocked by Java security’ problem, CyberGhost is highly recommended VPN.

Why choose CyberGhost?
cyberghost vpn for windows logo
  • 256-bit AES encryption
  • Over 5600 servers worldwide
  • Great price plans
  • Excellent support


NordVPN gives you global connectivity to social media content, messaging apps, and streaming websites without geo-restriction or censorship. Also, its military-grade encryption ensures all your internet activity is private.

In addition, NordVPN comes with DNS leak protection feature; this prevents your computer from DDoS attacks. Also, NordVPN offers user-friendly applications for all major operating systems.

Download now NordVPN

— RELATED: Ranking the 8 fastest VPN for Windows 10 in 2018

  • Hotspot Shield

Hotspot Shield is the most popular VPN service providers with over 600 million users worldwide. This VPN software enables you to access location-based websites, unblock any websites, access censored messaging apps flawlessly.

Also, their VPN client software is excellent with no issues such as ‘VPN blocked by Java security’ problem; therefore, you get to anonymize your internet activity without issues by using Hotspot Shield.

Download Hotspot Shield

Solution 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.