I am unable to do screen sharing, video chat, audio chat

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Level 1

6 points

I am unable to do screen sharing, video chat, audio chat

Ever since I updated to Yosemite 10.10.2, I am no longer able to share my screen, audio chat or video chat. I had used it before the update and all the settings remain the same. I do not use or ever have used the firewall. My iMessage settings are correct, screen sharing settings are correct. I know of 3 other people that this is happening to. There is no issue with Facetime, that works like it is suppose to work.

I was wondering if anyone else has tried to share their screen since updating to 10.10.2. Any help would be greatly appreciated. Thanks, Barjo.

iMac, OS X Yosemite (10.10)

Posted on Mar 19, 2015 1:06 PM

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Answer 1

Mar 20, 2015 2:51 PM in response to barjo

Hi,

I have Screen Shared to iChat 5 (my own MacBook Pro) over AIM and Bonjour (The Original iChat way from the Buddy lists).

I have also done it the iMessages way to my daughter's iMac also running Yosemite.

I have not installed the Security Update 2015-002 that came out recently.

9:51 pm Friday; March 20, 2015

 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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Answer 2

barjo Author

Level 1

6 points

Mar 20, 2015 3:30 PM in response to Ralph-Johns-UK

Thank you for your reply, I also use AIM with iMessage. I did install the Security Update 2015-002 that came out recently and that is when I think it stopped working. Since my post, I disabled the iMessage Account and used only AIM and it worked like it was suppose to. I also determined that if the person you want to screen share with has their iMessage enabled and I have it disabled it will work, but if both of us has it enabled it does not work right or will work sometimes. You may share the screen, but one or the other is not able to hear the other person. We also get an error message after 10 seconds of waiting, it says to the effect that no data has been sent. I have an iMac mid 2011. So I am guess Apple needs to do a fix for this Security Update.

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Answer 3

Mar 22, 2015 1:14 PM in response to barjo

Hi,

In iChat in the early days there were listed ports that the app used.

See Using iChat with a firewall or NAT router - Apple Support

This divides things into Login ports:-

5190 on TCP for AIM (although 443 worked better)

5222 or 5223 on TCP for Jabber logins depending if SSL was used (5223) or not.

For File Sharing or sending Pics-in-chats AIM moves to port 5190 on the UDP protocol.

It still does this in Messages even though the AIM login is not on port 443.

For Video, Audio Only and Screen Sharing connections the process is the same.

A visible invite is sent on port 5678 (UDP)

Then the app sends and SIP Invite on port 16402 by default (in the link it used to be on port 5060).

It now stays on this port as default as Vid in, Vid out, Audio In and Audio out are now on the same port. (it used to start at the bottom four of 16384-16403 but now use top down from 16402 to 16393 if the first is not available.).

In Screen Sharing the Audio Chat (for AIM and Jabber) is made and the VNC connection for the Screen Share is on a random port.

Now the iMessages' Invoke of the Screen Sharing app uses port 5900 to send data.

The 10 sec error is about the AIM/Jabber invite and connection being accepted but there then being a break in the connection.

It can occur almost simultaneously with the Connection or later in the chat.

If it is later it can be caused by anything:-

An Ethernet cable being pulled.

WiFi dropping out some some reason.

Any interruption of the internet.

Any variances in the service from the Internet provider that looks like a break.

At both ends go to Messages > Preferences> Video and change the Bandwidth Limit to 500kbps

This is still fast enough for four way Video chats but smooths out any larger variances at either end and also stops one end "overrunning" the other if there is a large difference in internet speeds.

It may also pay to allow the Screen Sharing app in the Firewall if it is ON.

The app is in /System/Library/CoreServices/Applications

8:08 pm Sunday; March 22, 2015

 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

Reply