Navigate to C:\Windows\System32. Right-click termsrv.dll → Properties → Security → Advanced → Change owner to your Administrator account. Then grant yourself "Full Control".
Alternatively, use PowerShell:
takeown /f C:\Windows\System32\termsrv.dll
icacls C:\Windows\System32\termsrv.dll /grant administrators:F
Remote Desktop Protocol (RDP) is one of the most powerful built-in tools in the Windows ecosystem. It allows IT administrators, developers, and everyday users to connect to their machines from anywhere in the world. However, since the days of Windows XP, Microsoft has imposed a deliberate restriction on client versions of Windows (Home, Pro, Enterprise, etc.): only one concurrent user can be logged into the system via RDP at a time. universal termsrv.dll patch windows 10
If a second user attempts to connect remotely, the first user is disconnected, forced to a login screen, or denied access entirely. For home labs, small businesses, or power users sharing a single workstation, this limitation is frustrating—especially when server-grade Windows (Windows Server) allows multiple concurrent connections without issue.
Enter the Universal Termsrv.dll Patch.
This specialized, unofficial modification replaces or patches the core system file termsrv.dll (Terminal Services DLL) responsible for enforcing the single-session rule. When applied correctly, it unlocks the ability for multiple users to connect simultaneously to Windows 10, just like a Windows Server machine.
In this detailed guide, we will explore: Navigate to C:\Windows\System32
Run a Linux VM on Hyper-V with Ubuntu Server + XRDP. XRDP natively supports multiple concurrent desktop sessions. This is 100% legal, free, and often more stable.