Since it is a system file, you must take ownership from TrustedInstaller using takeown /F "%windir%\system32\termsrv.dll" /A .
Universal Termsrv.dll Patch for Windows Server 2012 R2 The is a popular third-party utility designed to bypass the default concurrent session limits of the Remote Desktop Protocol (RDP). While Windows Server editions naturally support multiple sessions, specific licensing restrictions and "administrative mode" defaults often limit out-of-the-box simultaneous connections to just two. This patch allows administrators to unlock unlimited concurrent RDP sessions by modifying the termsrv.dll system file. Key Benefits for Windows Server 2012 R2
Provides a workaround for environments that need multiple access points without immediately investing in full Remote Desktop Services (RDS) Client Access Licenses (CALs). universal termsrvdll patch windows server 2012 r2 top
Removes the hard cap on how many users can remotely access the server at once.
Restart the service with Net start TermService . Important Considerations & Alternatives Since it is a system file, you must
Provide full control to administrators via icacls "%windir%\system32\termsrv.dll" /grant Administrators:(F) .
Use Net stop TermService in an elevated Command Prompt. Restart the service with Net start TermService
The patch typically involves replacing or modifying the termsrv.dll located in C:\Windows\System32 .