I encountered this using an upgraded Ubuntu 11.10 with vino
3.2.0-0ubuntu1.

If I set the password through "Desktop Sharing" my clients could not 
authenticate, I tried with both TightVNC and AndroidVNC clients.
When I unchecked the option to require a password, both clients were then able 
to connect.

I found various threads from 2007/2008 where people had to hit backspace
repeatedly to clear the password input box, I tried this but still
whenever I set a password authentication failed.

Password length was 8 characters.

When I used vino-password to set the password my clients could then
connect successfully.

As Elmer Medez suggested, it appeared the Desktop Sharing GUI has not
been not saving the inputted password correctly.

Further testing suggests that, if a password has previously been set,
the Desktop Sharing GUI does not overwrite it.

Steps to reproduce:
1) Use vino-passwd to set password to 'test1234'
2) Connect with client using 'test1234' as password - authentication succeeds.
3) Open "Desktop Sharing" GUI
4) Position cursor at end of password and use backspace four times to delete 
last four characters of password. Enter '5678' so that password should be 
'test5678'.
5) Connect with client using 'test5678'. Authentication fails.
6) Connect with client using the old password of 'test1234'; Authenication 
succeeds.
7) Use vino-password to set password to 'test5678'
8) Connect with client using 'test1234'; Authentication fails.
9) Connect with client using 'test5678'; Authentication succeeds.

I know I've used the GUI to set a password for a new installation and
that works fine, so I suspect the main condition for this bug is that a
password has previously been set.

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https://bugs.launchpad.net/bugs/879496

Title:
  Vino vnc connection refused post Ubuntu 11.10 upgrade

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