How can I set a fixed custom password in Teamviewer (server) without sending registration data?

Follow these steps (tested with v9 and v10):

  1. Press the pencil icon (below the password and ID assigned).
  2. Press "Next".
  3. Input your password (twice).
  4. Press "Next".
  5. On the next (registration) screen simply press "Cancel".

You will now see a hidden password beside the pencil. Your custom password is now stored and Teamviewer will always accept it, but (supposedly) you did not send any registration data.

Tested working on Linux and Windows. I suppose will work on most of the other operating systems.