Error "This Mac was unable to start a high performance connection ..."

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Error "This Mac was unable to start a high performance connection ..."

I am trying to connect my Mac Pro M2 Ultra to MBP 16 M2 Max. Weirdly, I can easily start the connection in High-Performance mode, and it works for a few seconds, and after that just goes to message "This Mac was unable to start a high performance connection...".

Everything works as expected when I use Normal mode.

And just to clarify, I am connected with the Thunderbolt 4 cable between Mac Pro and MBP. Also, Mac Pro is on 10Gbps network, MBP on 2.5Gbps, and they are both connected to 6E WiFi. I don't see how much faster I can make this connection.

https://youtu.be/tAMdZWNfOtg

Mac Pro (2023)

Posted on Mar 9, 2024 5:19 PM

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Answer 1

Mar 19, 2024 5:51 AM in response to outcoldman

Same here. Just spend an hour testing with Apple Care.

It appears I do not get the error if the connection is to a new admin account on the target ("server") Mac.

I tried disabling all software that opens at login on the target Mac without success.

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Answer 2

May 1, 2024 2:03 PM in response to outcoldman

Hi, I've the same problem, with error "This Mac was unable to start a High Performance connection to...", I'm trying to connect from a Macbook Air M2 to a Mac Mini M2 Pro. The problem is still present and started 1 week ago. Both macs are on Sonoma 14.4.1, but I can't relate the broken screen sharing with the update. I havn't find anything useful on logs or online

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Answer 3

Mar 25, 2024 11:58 AM in response to outcoldman

No improvement with macOS Sonoma 14.4.1 :-(

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Answer 4

May 1, 2024 9:17 AM in response to outcoldman

+1 on this. spend an hour with support but that wasn't any helpful. 2 MacBooks M1 2020, same 14.4.1, same network, firewall disabled. anyone had any progress in troubleshooting this?

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Answer 5

May 1, 2024 9:22 AM in response to outcoldman

Mine now works again, although I am still on macOS 14.4.1 on both machines and haven't changed anything in my network.

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Error "This Mac was unable to start a high performance connection ..."

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