539 iPhone_iPad_Mac_apple

Cannot screen share via iMessage

All of a sudden this feature has stopped working. My dad has just bought a mac and gets stuck sometimes so I have previously been able to send him an invite in messages to share his screen. All of a sudden this no longer works. The screen share icon is greyed out. I know I can also share via the screen sharing app by sending him an invite to his apple id but again, this doesn't work. I just get the message that I'm waiting for the invite to be accepted. Any ideas?

Hi,

Any chance the System Preferences > Sharing > Screen Sharing set up is set to Administrators Only ?

This would mean only Admin people set up with accounts on your computer could access it remotely.

The same would be true at your father's end.

This might be too much access...

As it lists All Users.

On the other hand this restricts it to Admin Accounts on your Mac.

If it is not that we have to look at the Firewall and whether it is allowing the Screen Sharing App.

It should be listed in the top section of System related stuff.

This might have prevented it's direct use as well.

However you need to list the Public IP address when using the Finder's Connect to Server and then set up the router to forward the port used to the Computer involved (Messages does this bit for you whichever method you use).

Apple Remote Desktop uses port 5900.

Recently there have been posts that people find that iMessages will not connect and this is related to their use of McAfee which then blocks Messages until it is allowed specifically.

It seems that Kaspersky has a similar issues as well after the OS X 10.10.3 update.

It seems the update effects the way these Apps are set up and the use of the internet by some apps.

Of course in this case you would need to check on the use of the Screen Sharing App rather than Messages if you have such an app.

9:11 pm Thursday; May 14, 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

Hi,

There are now two methods to Screen Share starting with the Messages app.

Method 1 (the 'iChat" way)

This uses accounts from Jabber or AIM at either end (i.e the two internet accounts that can Video and Audio Chat as Yahoo ones don't and Bonjour is LAN only)

For this the Video Menu needs to have Screen Sharing Enabled at both ends.

It can be confusing as a Apple issued ID (@mac.com an iCloud linked @me.com or an @icloud.com ID can also be used as an AIM Screen Name.

SO you need to be clear about which method and where the ID is being used.

The Method then means displaying the Buddy List.

You then highlight the Buddy and either click the Screen Sharing icon at the bottom of the Buddy list or use the item to start Screen Sharing in the Buddies menu.

To AIM to AIM (Or Jabber to Jabber) DO NOT use the Details drop down as this invokes the iMessages method and leads to failure.

Method 2 (The iMessages way).

To set up you need to go to System Preferences > Sharing > Screen Sharing and enabling this. (you may need to consider who is allowed to use it if you are the one sharing).

Then in an iMessages chat you can use the Details drop down and the Screen Sharing icon should be available.

This means it is iMessages to iMessages but only Mac to Mac.

Like iMessages invokes FaceTime for Audio or Video chats this Invokes the Screen Sharing App.

NOTES.

The screen Sharing app is part of the Apple Remote Desktop set up.

The app itself is actually in Hard Drive name/System/Core Services/Applications

It can also be invoked on a LAN when you connect to another Mac and you are offered the Share Screen Button.

It can also be used in the Finder > Go Menu > Connect to Server and using VNC:// instead of SMB or AFP to start the address.

Whilst every method described here is part of Apple Remote Desktop or at least it's "Engine" there are some differences

Both Finder methods do not have Audio chats along side.

The 'iChat way" uses the same method as a A/V connection and can be considered to be a Audio Chat with a VNC screen display.

The iMessage way seems to be a VNC connection with an Audio chat streamed alongside (it may actually be added but I have not worked that out yet).

9:46 pm Wednesday; May 13, 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

Thanks for the info. I have the necessary options turned on for sharing with messages. It may be that the sharing option is turned off on my fathers mac. It must have been done with an update as it used to work ok. I shall get him to double check the sharing options and let you know how I get on. Thanks again

Still no joy. My dad has screen sharing enabled and the screen sharing option is not checkable. Ive also tried to share via the screen sharing app but it doesn't connect. It attempts to connect but I get the message that it could not connect. Any ideas now?

Hi,

Any chance the System Preferences > Sharing > Screen Sharing set up is set to Administrators Only ?

This would mean only Admin people set up with accounts on your computer could access it remotely.

The same would be true at your father's end.

This might be too much access...

As it lists All Users.

On the other hand this restricts it to Admin Accounts on your Mac.

If it is not that we have to look at the Firewall and whether it is allowing the Screen Sharing App.

It should be listed in the top section of System related stuff.

This might have prevented it's direct use as well.

Apple Remote Desktop uses port 5900.

Recently there have been posts that people find that iMessages will not connect and this is related to their use of McAfee which then blocks Messages until it is allowed specifically.

It seems that Kaspersky has a similar issues as well after the OS X 10.10.3 update.

It seems the update effects the way these Apps are set up and the use of the internet by some apps.

Of course in this case you would need to check on the use of the Screen Sharing App rather than Messages if you have such an app.

9:11 pm Thursday; May 14, 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

Thanks again. His security settings are set all all users. You may have something with blocking connections and that's most likely to be it as he does tend to be over cautious with his settings so may well have disabled incoming connections.

for the Points.

If you need any more help then continue in this thread (it will be a long while before it is archived (viewable only) ).

To be clear "Adminstrators" have to have Account (Mac User Accounts) on that Mac to be accepted. Of course you would have to know the name of that Admin account and it's password.

Hope it works out.

7:40 pm Friday; May 15, 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

Ralph,

This all used to be so easy with iChat. My 86 year old mom has "problems" regularly and iChat was simple to use. We both had AIM accounts which I understand Apple is unable to use with messages. I have tried relentlessly all of these items and even more so that I can share and control her screen. I am ultimately in a state of frustration with the Apple Koolaid. I have the bonjour, AIM and iMessage accounts all enable. I am looking for a simple and sure solution to get the screen sharing to work again. I have flowed your posts before and they are great, better than Apple genius technicians which have been unable to help. Very disappointing! Is there another piece of software or freeware that works. I don't know where these "ports" are located or how to turn them on, so I am open to more instructions. Thanks.

最后更新：2017-09-20 09:47:02

Cannot screen share via iMessage

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