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RDP connects but immediately fails between two hosts – UltraVNC also broken

How to fix RDP connects but immediately fails and UltraVNC connection errors

Are you struggling with remote desktop issues where RDP connects but immediately fails or closes between two hosts? This comprehensive guide shows you how to fix RDP connection dropped errors, resolve UltraVNC broken connection issues, and get your remote access working smoothly again. Whether you are facing RDP disconnecting after login, black screen on RDP, or UltraVNC failed to connect errors, we walk you through troubleshooting steps, including adjusting MTU settings, disabling UDP in RDP, checking firewall rules, updating network drivers, and configuring encryption levels. This step-by-step solution helps you fix remote desktop problems for Windows 10, Windows 11, and Server environments to prevent RDP and VNC failures in the future.

In This Video We Will See How to Fix RDP connects but immediately fails between two hosts and UltraVNC broken connections.

Here Are The Steps to Fix RDP and UltraVNC Connection Issues

Method 1: Disable UDP for RDP

1. Press Windows + R, type gpedit.msc and hit Enter
2. Navigate to Computer Configuration - Administrative Templates - Windows Components - Remote Desktop Services - Remote Desktop Connection Client
3. Double-click Turn Off UDP On Client
4. Select Enabled
5. Click Apply and OK
6. Restart Your Computer
7. Done!

Method 2: Adjust MTU Settings

1. Search Command Prompt and Run as Administrator
2. Type: netsh interface ipv4 show subinterfaces
3. Identify your active network connection name
4. Type: netsh interface ipv4 set subinterface "Your Connection Name" mtu=1450 store=persistent
5. Press Enter
6. Restart Your Computer
7. Done!

Method 3: Disable Persistent Bitmap Caching

1. Open Remote Desktop Connection app
2. Click Show Options
3. Go to the Experience tab
4. Uncheck Persistent bitmap caching
5. Try connecting again
6. Done!

Method 4: Fix UltraVNC Mirror Driver and Settings

1. Open UltraVNC Server Property Page
2. Ensure Check Video Hook Driver is selected
3. Go to the Security tab
4. Verify Password and Encryption settings match the Client
5. Restart the UltraVNC Service
6. Done!

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