Using a third-party patch on a core system file was never for the faint of heart.
Microsoft officially ended extended support on July 14, 2015. This means the operating system no longer receives security patches, Using a third-party patch on a core system
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Windows Server 2003 utilizes Windows File Protection to prevent the unauthorized replacement of critical system files. If termsrv.dll is replaced while WFP is active, Windows will immediately overwrite the modified file with a clean backup from its cache. Patches must temporarily disable or bypass this mechanism. 2. Stopping the Terminal Services Service Try again later
Select the default security mode (Full Security or Relaxed Security). Restart the server to finalize the installation.
Instead of modifying critical system files, administrators should use the built-in, compliant methods provided by the operating system to manage remote connections. Enabling Official Terminal Server Mode