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I have a VNC server running on a Mac. When I try to use a VNC viewer, it says "no matching security types".

Is there any other software which can connect to a Mac like RDP?

If iI use screen sharing from another Mac, then it works but not from VNC.

EDIT: I am using:

  • Leopard 10.5.7,
  • vnc VIEWER 4.1.3,
  • nothing installed on MAC,
  • On Same LAN,
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Is this the built-in VNC server in OS X? What version of OS X are you running? What VNC viewer are you using? Is this on the same LAN? is there a network device between the two computer like a router or firewall? – Wesley Mar 9 '10 at 1:11
I have edited the question – John Mar 9 '10 at 1:35
up vote 2 down vote accepted

Try TightVNC to connect. It seems to work when the free edition of RealVNC does not.

I've also found that the VNC viewer will konk out when connecting to the Mac if the viewer is not running in millions or full color mode.

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I tried it and it says , server did not offer supported security type – John Mar 9 '10 at 4:18
It also says , no configured security type is supported by 3.3 viewer – John Mar 9 '10 at 4:25
That's because of the version conflict I referred to in my answer. – John Gardeniers Mar 9 '10 at 4:26
I installe VNC enterprise view , finally it got connected but looks weired like only 16 colors or something – John Mar 9 '10 at 4:34
Now TightVNC is also working but the problem is color , TightVNC also shows only 256 colors – John Mar 9 '10 at 5:52

I'm not sure which VNC server you have running on your Mac, but you can use the built-in one.

Apple menu --> System Preferences --> Sharing --> Screen Sharing

Make sure that its configured for VNC access with a password. Then try to connect to TCP port 5900 with a VNC client on your PC.

To answer the other question: VNC is the Mac answer to RDP, actually. Even the commercial "Apple Remote Desktop" package ultimately uses the VNC protocol.

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I had the same problem and this worked for me. Simply configure a password in the option popup. – PiTheNumber Mar 26 '12 at 13:02

Try turning off encryption, works for me for a similar problem.

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I ran this command and could get it to work with RealVNC Open/Free edition viewer. Ensure that on the client, the color level is set to Full [Options->Colour & Encoding->Colour Level]

sudo /System/Library/CoreServices/RemoteManagement/ -activate -configure -access -off -restart -agent -privs -all -allowAccessFor -allUsers -clientopts -setvncpw -vncpw secret -setvnclegacy -vnclegacy yes

This method works via the command line (local terminal and remote ssh session too).

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Had the same problem on El Capitan. TightVNC viewer (version 2.7.10) worked without any problem with Yosemite but failed to connect to Mac after upgrade to El Capitan. Looks like TightVNC 2.7.x does not support VNC protocol used by newer versions of OSX.

I've switched over to RealVNC Viewer (version 5.3.1) which works without any error.

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From memory you'll need to either use a v3.x viewer or configure the one you have to use the version 3 protocol. How depends on your viewer but it should be covered in its help file or web site.

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You can encounter this problem if the server does not have a password configured, or the server is running with integrated authentication and you are using the free VNC viewer. The free VNC viewer does not support some of the newer authentication methods.

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Any VNC client I've tried works. On your Mac

  1. Go to System Preferences -> Sharing -> Enable Screen Sharing
  2. Click the Computer Settings... button
  3. In the drop-down sheet, check both boxes for Anyone may request permission to control screen and VNC viewers may control screen with password:
  4. Enter a password
  5. Click OK button
  6. Leave system preferences

Once you've done that, be sure not to use 256 colors. Then, when connecting from your other computer you should be prompted for a normal VNC password, followed by the OsX login screen, where you can choose the user you'd like to log in as.

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