I forgot to turn on "VNC viewers may control screen with password", to enter on my working Mac, is there way to turn-on this feature remotely via SSH (I'm on WindowsXP now)?
Putty is a good SSH client for Windows.
SSH into your remote OS X machine with an administrator’s log in and password.
Enable Remote Desktop (a.k.a. Screen Sharing, a.k.a. VNC) with this command:
sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart \ -activate -configure -access -on \ -clientopts -setvnclegacy -vnclegacy yes \ -clientopts -setvncpw -vncpw mypasswd \ -restart -agent -privs -all
Login using a VNC client. As I mentioned, TightVNC worked for me; for some reason, RealVNC and UltraVNC didn’t. Your password is “mypasswd” (see the -vncpw flag in the above command; you can and should change this).
When you are done, turn of screen sharing using your SSH session:
sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart \ -deactivate -configure -access -off
Here is a different way that enables screen sharing access all current users, instead of using a single vnc password;
sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart \ -activate -configure -access -on \ -configure -allowAccessFor -allUsers \ -configure -restart -agent -privs -all
Disable the same as before.
This allows you to connect to the remote computer from a mac using the
share screen button in Finder.