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Is it mandatory to authenticate?

Yes, if you have a Home or Professional subscription. You must enter remote access credentials the first time you connect to a particular computer, though you can ask VNC Viewer to remember the password subsequently.

If you have an Enterprise subscription, you have a little more flexibility:

  • If you have a managed network environment, you can set up single sign-on so users are silently authenticated by secure network services.
  • If you only wish to establish direct connections, you can turn authentication off for a particular remote computer providing you are sure you can trust everyone on your local network (note this is never for Internet connections). See how to do this.