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Screen sharing Lion->Lion problem

544 Views 10 Replies Latest reply: Dec 31, 2012 1:47 AM by tutlek RSS
tutlek Calculating status...
Currently Being Moderated
Dec 5, 2012 9:41 AM

I am trying to set up screen sharing in my local network.


I am using a MacBook with latest Lion as server to which I am trying to connect.


I am connecting with a Powerbook 12" 10.5.8 without problems and controlling the MacBook via Screen Sharing.


I am unable to connect to the MacBook using a MacBook Pro with same Lion installed.



Before that I used the same setup to try out RealVNC. Again, the Powerbook connected to the MacBook without problems, but the MacBook Pro is unable to connect.


Any suggestions?



PowerBook, Mac OS X (10.5.8), 12", 1.5 Ghz 1.25 GB RAM
  • BobHarris Level 6 Level 6 (12,545 points)
    Currently Being Moderated
    Dec 5, 2012 11:57 AM (in response to tutlek)

    Is your Macbook Pro client you using Mac OS X Lion (or Mountain Lion as this is the Mountain Lion forum) Screen Sharing client or are you  using RealVNC client?


    On the destination Macbook are you using System Preferences -> Sharing -> Screen Sharing? (preferred)


    Or are you using System Preferences -> Sharing -> Remote management? (ONLY if you are controlling a room full of Macs, such as a classroom or office environment).


    Or are you using the RealVNC Server?


    If using System Preferences -> Sharing -> Screen Sharing, what is "Allow access for:" set to?   "All users" or a select subset of users?


    If connecting using the Macbook Pro Mac OS X Screen Sharing client to the Macbook Mac OS X Screen Sharing server, are you specifying the username and password of an allowed Macbook account?


    Or are you trying to use the VNC password as specified by the Screen Sharing -> Computer Settings... -> VNC viewers may control screen with password: xxxxx

  • BobHarris Level 6 Level 6 (12,545 points)
    Currently Being Moderated
    Dec 5, 2012 5:00 PM (in response to tutlek)

    Do you get errors?  If so what are they.


    In the past, I have had issues Leopard, such that I needed to clear out my Kerberos credentials from an Applications -> Utilities -> Terminal session





    I did this on both client and server.


    I'm not saying this is your problem.  Just mentioning something that has happened to me in the past.

    it would be good to get any error messages, dialogs you see.

  • BobHarris Level 6 Level 6 (12,545 points)
    Currently Being Moderated
    Dec 5, 2012 6:56 PM (in response to tutlek)

    This thought just occurred to me.  Do you have the Macbook Pro Firewall enabled?  System Preferences -> Security & Privacy -> Firewall.  Is it enabled?  If it is, try disabling it.


    Time to ask a question about your network setup.  Wild Goose Chase questions.


    You mentioned an Airport Extreme.  Is that the ONLY router in the house?  The reason I ask, is that if you have multiple WiFi routers (for example because your house is so large, you need more than one WiFi router to cover the entire house, or your house has has 4 floors you need to cover and the structure interferes betwen the basement to the converted attic), you could have multiple subnets which could affect the ability to connect to devices on the other subnet.  If you do have multiple subnets, there are ways to address this.


    I would like you to download and run "Bonjour Browser"



    Run Bonjour Browser on the Macbook Pro (and any other Macs you like).  I want you to look for "Remote Frame  Buffer" entries (VNC Servers - aka Screen Sharing servers).  Click the triangle to show all the systems offering VNC server.


    Assuming you see your Macbook listed, click on its triangle to show the IP address and port number.  It should be something like 10.0.1.nn:5900.  Hopefully you see the same IP address as you think your Macbook has assigned to it (which you can see via Macbook -> System Preferences -> Network -> Advanced -> TCP/IP.


    If you are not seeing your Macbook via Bonjour Browser from your Macbook Pro, then there is something affecting your ablity to see the Macbook.

  • BobHarris Level 6 Level 6 (12,545 points)
    Currently Being Moderated
    Dec 6, 2012 7:13 AM (in response to tutlek)

    If you Mac stays at home, then Stealth mode is meaningless.


    On the road, Stealth mode means you Mac will not respond to queues on unopened ports.  Normally a query on an unopened port would get a Negative Acknowledgement, which would tell the query a system was at this address and maybe worth investigating further.


    But generally speaking if you have good passwords on any Sharing services you are offering, it is unlikely someone will break into your Mac.

    If having the Firewall services active when you are on the road, you might want to look at ControlPlane

    <> that claims to dynamically switch many of your settings based on where you are, so at home you could have Firewall off, and out of the house, have it on.


    I'm glad you found the problem.

  • BobHarris Level 6 Level 6 (12,545 points)
    Currently Being Moderated
    Dec 7, 2012 6:13 AM (in response to tutlek)

    I'm down to very wild guesses now


    By any chance do you have a neighbor with an unprotected WiFi network?  What I'm thinking is maybe your Macbook Pro is connecting to the neighbor's network instead of yours.


    This actually  happened to me once, so it is not totally far fetched.  Then again, most likely not the problem either.


    You could try turning off WiFi, then turning it back on again.


    Have you tried plugging in an ethernet cable just to see if it is the WiFi vs networking in general vs just Screen Sharing.


    You could try a reboot?  I almost never suggest this, but when desperate...


    Again, I'm just throwing suggestions at the wall, but I'm not very confident anything will stick.


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