Software⏱️ 3 min read📅 2026-05-29

How to Fix: Should I be worried about this MicrosoftSecurityApp.exe error pop-up?

MicrosoftSecurityApp.exe error pop-up: Unknown exception in application, possible protocol error during remote PC connection.

Quick Answer: Try disabling and re-enabling Windows Defender to see if it resolves the issue. If not, consider running a full system scan with Windows Defender or seeking further assistance from Microsoft support.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

The error message 'Unknown exception 0xe0434352 in application at position 0x00007FFF...' is a generic Windows error that can occur due to various reasons. This error typically occurs when there's an issue with the Remote Desktop Protocol (RDP) or the connection between your local machine and the remote PC.

⚠️ Common Causes

  • Outdated or corrupted RDP files on the remote PC.
  • Conflicting applications running in the background that interfere with RDP connections.
  • Firewall settings on either machine that block RDP traffic.

🛠️ Step-by-Step Verified Fixes

Method 1: Update RDP Files

  1. Step 1: Open the Remote Desktop Services console on the remote PC and check for any available updates to the RDP files.
  2. Step 2: Apply any available updates and restart the remote desktop service.
  3. Step 3: Attempt to connect to the remote PC again using mstsc.exe.

Method 2: Disable and Re-enable RDP

  1. Step 1: Open the Windows Defender Firewall with Advanced Security console on both machines.
  2. Step 2: Disable the RDP service on both machines and then re-enable it.
  3. Step 3: Attempt to connect to the remote PC again using mstsc.exe.

Method 3: Reset RDP Connection

  1. Step 1: Open the Command Prompt as an administrator on your local machine.
  2. Step 2: Run the command 'netsh rdp client' to reset the RDP connection settings.
  3. Step 3: Attempt to connect to the remote PC again using mstsc.exe.

💡 Conclusion

By following these steps, you should be able to resolve the 'Unknown exception 0xe0434352 in application at position 0x00007FFF...' error message when connecting to a remote PC using mstsc.exe. If the issue persists, it may be worth seeking further assistance from Microsoft Support or a qualified IT professional.

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