Because r2rcerttest.exe is not a standalone application but a component of Remote2Remote, . Doing so can break the parent software and generate dependency errors.
Windows Defender SmartScreen or a third-party AV quarantines the file. Cause: The executable attempts to open a network port (usually 42966) without prior authorization. Fix: Manually allow the file in your antivirus settings. Navigate to "Allow an app through firewall" and add the full path to r2rcerttest.exe . r2rcerttest.exe