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In my iMac, I have installed NET9 and the workload for MAUI, latest version.
I created a shiny MAUI project based on NET9. When I try to run the application from Visual Studio to a simulator such as iPhone 15 iOS 18.1, I get this error
MSBuild was unable to connect to the Mac with Address='192.168.1.104' and User='Enrico Rossini'. This connection is separate from Visual Studio and without it the project can't build. Please try building again or report this problem if the issue persists
I built the project multiple times, clean the obj and bin folders, restart all machines.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(76.8, 23%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMK%3C/text%3E%3C/svg%3E)
I have the exact same issue, when I use my new mac mini M4
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 61%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBS%3C/text%3E%3C/svg%3E)
you need to pair your Mac. see:
https://learn.microsoft.com/en-us/dotnet/maui/ios/pair-to-mac?view=net-maui-9.0
basically VS2022 uses SSH to execute shell commands on the Mac. The pairing is basically configuring the VS2022 SSH component (ip, username and password). Once the connection is working, VS will check for an Xcode install. to build it copies files to Mac and runs Xcode.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(262.40000000000003, 12%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGS%3C/text%3E%3C/svg%3E)
Hi Bruce,
I too am getting this error on build:
MSBuild was unable to connect to the Mac with Address='xxx.xxx.x.xx' and User='******@xx.com'. This connection is separate from Visual Studio and without it the project can't build. Please try building again or report this problem if the issue persists
So, I clicked on forget this Mac.
Then I stopped Visual Studio 2022 and restarted my solution.
Then added my Mac and I'm still getting the error.
Anything else I can do?
Thanks,
Grant
Also I just updated my solution from .net 8 to .net 9
maui 8 (net 8) is out of support so you should be on .net 9.
did you enable ssh support on your Mac?. under system steering -> general -> sharing -> remote login, enable.
note: I don't use pair to Mac, as I only have a Mac, but be sure you install Xcode. and I think you need the maui workload installed. if you upgraded to .net 9, you need to reinstall the maui workload.
% dotnet workload install maui
% dotnet workload list
Installed Workload Id Manifest Version Installation Source
--------------------------------------------------------------------
maui 9.0.51/9.0.100 SDK 9.0.300
Hey Bruce,
I updated the to iOS 15.5, XCode 16.4 and added the .Net 9 Runtime.
I can now fully connect the Mac Mini and build the solution.
Thanks for all of your help.
Have a great day,
Grant