Vlad Ghitulescu

Q: Which ports must be open für ScreenSharing?

Hello!

 

 

Since my ISP-change a couple of months before I am not able to use the screensharing-app anymore.

 

I try to connect (via CMD+K from Finder and then "vnc://îp_number") but after trying a couple of minutes I get an error message from the screen-sharing-app saying that the connection wasn't possible.

 

I've tried to connect to different Macs using different versions of OS X (Yosemite, Mavericks and even a PowerPC - Mac Mini running 10.5.8), all of them set to enable screen-sharing-connections - with no success! :-(

 

So I came to the conclusion that my router (a VDSL-router from Telekom) must block the ports necessary for screen-sharing, because it did something similar blocking the ports for VPN - normally open on an Airport Extreme!

Sadly I cannot use the Airport Extreme with VDSL, so I am not even able to check if my presumption is true :-(

 

However I know how to switch the ports on and off, so now I "only" need to know WHITCH ports are needed for screensharing to work.

 

Could anybody help me with this information?

 

Thank you!

 

 

Regards,

Vlad

 

 

P.S. I am using a late 2012 27" iMac (3,4 GHz Intel Core i7) running OS X Yosemite 10.10.2

iMac (27-inch, Late 2012), OS X Yosemite (10.10.2)

Posted on Feb 16, 2015 3:53 AM

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Q: Which ports must be open für ScreenSharing?

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  • by BobHarris,

    BobHarris BobHarris Feb 20, 2015 3:21 PM in response to Vlad Ghitulescu
    Level 6 (19,575 points)
    Mac OS X
    Feb 20, 2015 3:21 PM in response to Vlad Ghitulescu

    FYI.  If the 109.100.181.55 address is still your Mom's IP address, I too get

    ping 109.100.181.55

    PING 109.100.181.55 (109.100.181.55): 56 data bytes

    Request timeout for icmp_seq 0

    Request timeout for icmp_seq 1

    Request timeout for icmp_seq 2

    Request timeout for icmp_seq 3

    So I'm not sure it is you.  It is possible that the router is setup to not respond to ping.

  • by Roote,

    Roote Roote Feb 20, 2015 7:14 PM in response to Vlad Ghitulescu
    Level 2 (417 points)
    Feb 20, 2015 7:14 PM in response to Vlad Ghitulescu

    Disclaimer: I know nothing about your particular router model.

     

    Two suggestions:

     

    1. Many routers allow you to set it to Bridge Mode. Your modem will will stop acting as a wireless modem and router and instead it will act as a pass-through modem. This will allow you to use Airport Extreme for wireless. If this is possible at all, it may require the assistance of your Internet provider to set up.

     

    2. In some troublesome configurations, on both ends of a connection, I've had success with a free Nat-PMP and UPNP app called Port Map by TheCodingMonkeys.

    Screen Shot 2015-02-20 at 6.19.46 PM.png

    Screen Shot 2015-02-20 at 7.26.00 PM.png

    Screen Shot 2015-02-20 at 7.12.09 PM.png

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 12:32 AM in response to rccharles
    Level 1 (11 points)
    Feb 21, 2015 12:32 AM in response to rccharles

    ok, than only TeamViewer and no LogMeIn

     

    BUT: it looks like I have general problems (see my ping-results) I have to solve first :-(

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 12:35 AM in response to BobHarris
    Level 1 (11 points)
    Feb 21, 2015 12:35 AM in response to BobHarris

    Yes, my mother still has this IP.

     

    Ok, than her router is also something to be solved… :-( this will be the worst part :-((

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 12:38 AM in response to BobHarris
    Level 1 (11 points)
    Feb 21, 2015 12:38 AM in response to BobHarris

    I got the same ping-response with my brother, also in Romania.

    He's running Mavericks on a Mac Mini (not the current model but the previous one).

     

    Both of them are changed to Telekom and received a modem-router-combo, so it is possible that both of them has the same problem (regarding to no response to ping AND my screen sharing attempts)

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 1:16 AM in response to Roote
    Level 1 (11 points)
    Feb 21, 2015 1:16 AM in response to Roote

    Thanks for the idea with PortMap.

     

    I've send it to my mother and brother with the instructions how to use it and asked for screenshots.

     

    Meanwhile I started PortMap myself and voila:

     

    Bildschirmfoto 2015-02-21 um 09.45.02.png

    I myself am a Telekom (Germany) client and connect to internet through a VDSL-router (named Speedport W 724V) from Telekom (that's the only alternative if I want to use VDSL).

    (I put my AirPortExtreme in Bridge mode and connect the iOS-devices wireless to his WLAN in order to enjoy at least for them the easy Apple configuration! :-)

     

    I will google a  bit in order to find how to enable NAT-PMP on my Speedport W 724V from Telekom… it can be the same problem my mother and brother have with their router!

     

    Thanks again!

     

     

    Regards,

    Vlad

     

     

    P.S. My IP address is 93.213.68.226. Previously I opened the port 5900 as suggested. I've just opened the screensharing settings:

     

    Bildschirmfoto 2015-02-21 um 10.12.26.png

    Could please somebody try

     

    a) ping me and

    b) request screensharing?

     

    Thank you!

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 1:17 AM in response to Vlad Ghitulescu
    Level 1 (11 points)
    Feb 21, 2015 1:17 AM in response to Vlad Ghitulescu

    What's about the endless list as response to ping google.com?

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 1:26 AM in response to Vlad Ghitulescu
    Level 1 (11 points)
    Feb 21, 2015 1:26 AM in response to Vlad Ghitulescu

    ok, now I know: there's no way to enable UPNP on my Speedport W 724V router, I must switch every port on manually :-/

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 1:38 AM in response to Vlad Ghitulescu
    Level 1 (11 points)
    Feb 21, 2015 1:38 AM in response to Vlad Ghitulescu

    and this is the answer my mother become from PortMap:

     

    Bild 3.png

  • by rccharles,

    rccharles rccharles Feb 21, 2015 12:46 PM in response to Vlad Ghitulescu
    Level 6 (8,506 points)
    Classic Mac OS
    Feb 21, 2015 12:46 PM in response to Vlad Ghitulescu

    I think you should try out TeamViewer.  I suspect it will avoid all the hassles of worrying about internet address and router configuration.  Logmein was no sweet to set up and use. I think Logmein did all its communication via http or https to avoid all configuration hassles.

     

    These internet fraudsters were using Logmein to "fix"(mess up) your pc.  They must know something about accessing the widest set of pc's with the fewest hassles.

     

    Robert

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 21, 2015 11:28 PM in response to rccharles
    Level 1 (11 points)
    Feb 21, 2015 11:28 PM in response to rccharles

    Ok, I'll try TeamViewer then and report my success :-)

    Thanks again!

     

     

    Regards,

    Vlad

  • by Drew Reece,

    Drew Reece Drew Reece Feb 22, 2015 1:12 AM in response to Vlad Ghitulescu
    Level 5 (7,689 points)
    Notebooks
    Feb 22, 2015 1:12 AM in response to Vlad Ghitulescu

    Has your 'remote end' got a Gmail/ AIM/ Jabber account and do you have one too?

     

    It may be possible to use the "share screen" feature of Messages app assuming your can talk someone through a few account setup steps via telephone etc.

     

    That may allow you enough access to setup the remote end correctly. If you know the router password you can probably login via Safari at that end & configure that is required (Teamviewer may need to create port rules dynamically, which is the reason for the UPnP/PMP error).

     

    Messages screen sharing works with AIM, Jabber, Google Talk and Bonjour (local network) accounts.

    The requirements don't mention UPnP/PMP.

    Messages (Mountain Lion): Requirements for audio chats, video chats, and screen sharing

     

    P.S.

    As Camelot mentioned already, opening port 5900 to the internet is not a great idea, are you certain the remote end at the company has strong passwords on ALL enabled user accounts? VNC may allow any botnet or script kiddie to attempt to brute force the passwords & usernames. Personally I would run ssh & avoid opening access to any other service, but that involves a lot more manual setup than Teamviewer or any other remote access service, (ssh can be setup to ignore username/ password requests, so only users with pre setup ssh keys can access the server).

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 22, 2015 4:55 AM in response to Drew Reece
    Level 1 (11 points)
    Feb 22, 2015 4:55 AM in response to Drew Reece

    > Has your 'remote end' got a Gmail/ AIM/ Jabber account and do you have one too?

     

    Yes, Gmail & AIM.

     

     

    > It may be possible to use the "share screen" feature of Messages app assuming your can talk someone through a few account setup steps via telephone etc.

     

    That would be ok for me (Yosemite), but not for my mother (who uses a Power Pc Mac Mini running Mac OS X 10.5.8 - where iChat & Skype is not supported anymore) :-(



    > As Camelot mentioned already, opening port 5900 to the internet is not a great idea, are you certain the remote end at the company has strong passwords on ALL enabled user accounts? VNC may allow any botnet or script kiddie to attempt to brute force the passwords & usernames. Personally I would run ssh & avoid opening access to any other service, but that involves a lot more manual setup than Teamviewer or any other remote access service, (ssh can be setup to ignore username/ password requests, so only users with pre setup ssh keys can access the server).


    Thanks for the warnings! I'll close than the port.

     

    All I wanted was to be able to:

     

    1.- access my mother's Mac Mini via a VNC (in order to help her with the admin-part of it)

     

    and

     

    2.- masquerade the Skype-Version of 10.5.8 in order to work again.

  • by Drew Reece,

    Drew Reece Drew Reece Feb 22, 2015 1:31 PM in response to Vlad Ghitulescu
    Level 5 (7,689 points)
    Notebooks
    Feb 22, 2015 1:31 PM in response to Vlad Ghitulescu

    Apologies I missed that the remote was a PPC Mac. I don't think screen sharing was an option back then.

  • by Vlad Ghitulescu,

    Vlad Ghitulescu Vlad Ghitulescu Feb 22, 2015 10:27 PM in response to Drew Reece
    Level 1 (11 points)
    Feb 22, 2015 10:27 PM in response to Drew Reece

    Hi, Drew!

     

     

    > Apologies I missed that the remote was a PPC Mac.

     

    Oh, no problem, it's already a long thread and it's easy to overlook some details.

    That's why I stated again what I was looking for.

     

     

    > I don't think screen sharing was an option back then.

     

    Actually it was and it worked very well until the ISP and router change.

    Right now it doesn't work with her anymore but it also doesn't work with my brother either, and he has a "modern" Mac Mini (the model before the current one) with a "modern" OS X (Mavericks).

     

    Strange / Funny enough, my mother & my brother (both located in Romania) on the one hand and me (in Germany) on the other all changed to Telekom, so all of us have now the same type of router and a similar response from PortMap (see the screenshot I sent on Feb 21, 2015 10:38 AM).

     

    I'm also not able to ping anyone of them (and not even google.com!) - so it seems that the router it's pretty "impermeable" :-/

     

     

    Regards,

    Vlad

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