[Solved] Workaround to Fix VPN Application blocked by Java Security Error

Problem: ‘Application blocked by Java Security’ error dialog box prompt when attempt to connect VPN.

Application blocked by Java Security

Solution 1: Add websites to exception list in Java

Step 1: Go to Start > type Java control panel and press Enter key.

Step 2: Go to Security tab. If Security Level is set to Very High then reduce it to High.

Step 3: Click on Edit Site List button.

Step 4: Click Add to type in the site URL.

Step 5: In the highlighted line, type the URL and then click OK button.

Step 6: After launching web browser and attempting the URL, Do you trust prompt will come up, tick Always trust boxes and then click OK.

Solution 2: Clear Java cache

Step 1: Go to Start > type Java control panel and press Enter key.

Step 2: Navigate to General tab, and click Settings under the temporary internet files section.

Step 3: Click Delete Files on the temporary files settings dialog box

Step 4: Click OK on the Delete Files and Applications prompt and follow the prompts.

Solution 3: Flush DNS

Step 1: Go to Start > Type cmd.

Step 2: Type ipconfig /flushdns and press Enter.

Solution 4: Clear web browser cache

Step 1: Launch web browser e.g. Microsoft Edge

Step 2: Press Ctrl + Shift + Delete to access Clear recent history dialog.

Step 3: Under Time range to clear drop-down menu, select Everything.

Step 4: Make sure to check Cache box. Click on Clear Now.
Note: Ctrl + Shift + Delete can also be used to clear cache on other web browsers.

Solution 5: Reinstall VPN Software

Solution 6: Install Windows updates

Step 1: Go to Start > type windows update in the search box and then click on Windows Update to proceed.

Step 2: Check for updates and install the available updates.

Step 3: Restart PC after the update is completed.

Solution 7: Reinstall Java


What should I do when I see a security prompt from Java?
Why are Java applications blocked by your security settings with the latest Java?