Remote Desktop Protocol (RDP) is an essential feature in Windows, allowing users to connect to remote systems. However, by default, Windows allows only one active user session at a time. If you need to enable multiple simultaneous user sessions for administrative or testing purposes, patching the termsrv.dll file is one way to achieve this. The UniversalTermsrvPatch is a widely used method for this purpose. Below is a step-by-step guide on how to patch RDP using UniversalTermsrvPatch or other methods.

Step-by-Step Guide to Patch RDP

Prerequisites

1. Backup Your System: Before making any changes to system files, create a backup of your important data and set a restore point in Windows.
2. Administrative Access: Ensure you have administrative privileges on the system.

Method 1: Using UniversalTermsrvPatch

Step 1: Download UniversalTermsrvPatch

1. Find the Patch: Search for "UniversalTermsrvPatch" online and download the latest version from a reputable source. Make sure to download from a trusted website to avoid malware.

Step 2: Extract the Patch

1. Unzip the File: Extract the downloaded ZIP file to a convenient location on your computer.

Step 3: Run the Patch

1. Locate the Patch Executable: Open the extracted folder and find the executable file (usually named UniversalTermsrvPatch.exe).
2. Run as Administrator: Right-click on the executable and select Run as Administrator.
3. Apply the Patch: Follow the on-screen instructions to apply the patch to the termsrv.dll file. The patch will modify the file to allow multiple user sessions.

Step 4: Restart Your Computer

1. Reboot: After the patch is applied, restart your computer to ensure the changes take effect.

Method 2: Manual Registry Edit

If you prefer not to use third-party software, you can enable multiple RDP sessions by editing the Windows registry. This method requires caution, as incorrect changes can affect system stability.

Step 1: Open the Registry Editor

1. Access the Registry: Press Windows + R, type regedit, and press Enter.

Step 2: Navigate to RDP Settings

1. Locate the Key: Navigate to the following path:
   arduino

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   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server

Step 3: Modify the fSingleSessionPerUser Value

1. Find fSingleSessionPerUser: In the right pane, look for fSingleSessionPerUser.
2. Edit the Value: Double-click on fSingleSessionPerUser and change its value from 1 to 0. This change allows multiple sessions for the same user.

Step 4: Enable Remote Desktop

1. Enable RDP: Still in the Registry Editor, navigate to:
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   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server
   and ensure that AllowTSConnections is set to 1.

Step 5: Restart Your Computer

1. Reboot: Close the Registry Editor and restart your computer for the changes to take effect.

Additional Method: Modify Group Policy (Windows Pro and Enterprise Editions)

If you have Windows Pro or Enterprise, you can also use the Group Policy Editor to enable multiple sessions.

Step 1: Open Group Policy Editor

1. Access Group Policy: Press Windows + R, type gpedit.msc, and press Enter.

Step 2: Navigate to RDP Settings

1. Locate the Path: Go to:
   rust

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   Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Connections

Step 3: Edit the Limit Settings

1. Modify the Settings: Double-click on Restrict Remote Desktop Services users to a single Remote Desktop Services session and set it to Disabled.

Step 4: Apply Changes

1. Apply: Click Apply, then OK, and restart your computer.

Conclusion

By following the methods outlined above, you can successfully patch RDP to enable multiple simultaneous user sessions. Whether you opt for UniversalTermsrvPatch, manual registry editing, or Group Policy modifications, each method provides a way to enhance your remote desktop experience. Always remember to back up your system before making significant changes, and proceed with caution to ensure a stable and secure environment.