Network Diagnostics app missing

@Shawnnafromwa, assuming you have a Time Machine or other backup of your Sierra installation, you can find fairly detailed instructions in my previous post on this thread here (always read the whole thread): Re: Network Diagnostics app missing

My instructions assume a few things, like how to disable and enable System Integrity Protection and how to change ownership and permissions on files. You can Google how to do those - there are plenty of sites that explain how.

As danuke said, if you can't find a backup of Sierra, then you're out of luck. Make sure you give feedback to Apple in any case!

Apple has always been rather arrogant about what they think users need or don't need. This is a legacy of Steve Jobs. I can only guess that they thought Network Diagnostics was no longer needed. Please register your disagreement with Apple here: Feedback - macOS - Apple

New & improved instructions for restoring Network Diagnostics and Network Setup Assistant.

In High Sierra the Network Diagnostics and Network Setup Assistant apps are no longer in the /System/Library/CoreServices location as they had been previously. In order to restore them, you will need to have an installation of Sierra, such as a Time Machine or other backup or a Mac that hasn't been upgraded to High Sierra. You need to copy the following files to a location that you can access from the High Sierra Mac, such as an external drive:

/System/Library/CoreServices/Network Diagnostics.app

/System/Library/CoreServices/Network Setup Assistant.app

/System/Library/PrivateFrameworks/NetworkDiagnosticsUI.framework

/System/Library/PrivateFrameworks/SetupAssistantFramework.framework/Versions/A/S etupAssistantFramework

/System/Library/PrivateFrameworks/SetupAssistantSupport.framework/Versions/A/Set upAssistantSupport

Now restart the High Sierra Mac in Recovery mode and disable System Integrity Protection (SIP). This is necessary because the System folder must be modified:

Hold down the Command-R keys while restarting. Once Recovery starts up, click on Utilities in the menu bar (not the open window) and then Terminal. Run the following commands in Terminal:

csrutil disable

reboot

On your High Sierra Mac, copy the Network Diagnostics.app and Network Setup Assistant.app to their original location. Authenticate as an administrator.

Next in High Sierra, trash the following files (authenticate as an administrator):

/System/Library/PrivateFrameworks/SetupAssistantFramework.framework/Versions/A/S etupAssistantFramework

/System/Library/PrivateFrameworks/SetupAssistantSupport.framework/Versions/A/Set upAssistantSupport

Now move the files out of the trash and keep them in an appropriately named folder as backups.

Copy the following files to the corresponding location in High Sierra:

/System/Library/PrivateFrameworks/NetworkDiagnosticsUI.framework

/System/Library/PrivateFrameworks/SetupAssistantFramework.framework/Versions/A/S etupAssistantFramework

/System/Library/PrivateFrameworks/SetupAssistantSupport.framework/Versions/A/Set upAssistantSupport

Change owner of all files/folders to root by running the following commands in terminal from an administrator's account (enter the password at least once); copy and paste the commands into Terminal, one at a time:

sudo chown -R root:wheel /System/Library/CoreServices/Network\ Diagnostics.app

sudo chown -R root:wheel /System/Library/CoreServices/Network\ Setup\ Assistant.app

sudo chown -R root:wheel /System/Library/PrivateFrameworks/NetworkDiagnosticsUI.framework

sudo chown root:wheel /System/Library/PrivateFrameworks/SetupAssistantFramework.framework/Versions/A/ SetupAssistantFramework

sudo chown root:wheel /System/Library/PrivateFrameworks/SetupAssistantSupport.framework/Versions/A/Se tupAssistantSupport

Make aliases of the Network Diagnostics.app and Network Setup Assistant.app and drag them to a more accessible folder and/or the Dock.

Now that all files have been restored, enable SIP in Recovery using the following Terminal commands:

csrutil enable

reboot

If you followed all steps correctly, the Network Diagnostics.app and Network Setup Assistant.app should now work. Of course, we don't know how long they will continue to work. Our best hope is that Apple will restore these useful apps to macOS.

If you haven't already done so, tell Apple to do this at https://www.apple.com/feedback/macos.html

If you had read the whole thread, you would know that Wireless Diagnostics has been brought up several times:

https://discussions.apple.com/thread/8098137?answerId=32586169022#32586169022

https://discussions.apple.com/thread/8098137?answerId=32326000022#32326000022

https://discussions.apple.com/thread/8098137?answerId=32558671022#32558671022

https://discussions.apple.com/thread/8098137?answerId=32585983022#32585983022

It still is not the same app as Network Diagnostics.

Unbelievable, PATRICKMELE, you are at least the 5th person in this discussion who has brought up Wireless Diagnostics, which is NOT the same thing as Network Diagnostics.

https://discussions.apple.com/thread/8098137?answerId=32652172022#32652172022

In your previous post you said you were still on Sierra, but now it seems you've discovered you're actually on High Sierra. That's what this whole discussion is about, the fact that Apple removed Network Diagnostics and Network Setup Assistant from High Sierra. If you have a backup of your Mac from before you upgraded, then you're not screwed. If you don't, then I'm afraid you are, unless someone has posted the needed files somewhere. In case you have a backup or can otherwise find the files (like from someone who hasn't upgraded yet), my detailed instructions for restoring them are on the previous page of this discussion here: https://discussions.apple.com/thread/8098137?answerId=32636980022#32636980022

@LeonOJ, your solution only works for WiFi connections, not ethernet or anything else. For WiFi, there's still Wireless Diagnostics.

@Steven Jamar, see my detailed instructions for restoring Network Diagnostics earlier this discussion here: https://discussions.apple.com/thread/8098137?answerId=32636980022#32636980022

Just be careful when you copy the chown commands, as there will be an extra space at line breaks that you need to remove.

@Scouserboy, thanks for the positive feedback!

MariaNinguem, just to clarify, Network Diagnostics and Network Setup Assistant are two separate apps, each with their own frameworks. You don't even need Network Setup Assistant if all you want is Network Diagnostics. The latter has only one framework, so that's why it works. Have you tried the setup assistant to see if it works with only the one framework? It might be that the 10.10 version required only one. They're adjacent to each other in the same folder, so if you don't see it, SetupAssistantFramework.framework may not have been used yet.

I do recommend that you change ownership of the files back to root, especially after you re-enable SIP. All files in the System folder should be owned by root:wheel (shows up as "system" & "wheel" in Finder).

You are correct that Apple could change something else to make diagnostics stop working. This is another reason to set the ownership of the files correctly: the next time there's an OS update or upgrade, those files will likely be removed if they have the wrong owner. Make sure you store them in a safe place in case you need to repeat the process of restoring them in the future.

Don't forget to express your outrage to Apple, since I doubt if they read all of these discussions: Feedback - macOS - Apple

Can you add yourself to the Sharing & Permissions pane, otherwise you may need to disable System Integrity Protection, boot to your Recovery Disk go to Utilities ,click on Terminal and enter csrutil disable press return and then reboot.

You almost certainly need to have System Integrity Protection disabled to do this. I already had SIP disabled when I followed your steps.

In addition to changing SetupAssistantFramework.framework, you also need to change SetupAssistantSupport.framework, just below it.

And to do everything correctly, the owner of all 4 files should be changed to root and the permissions set to rwxr-xr-x.

Finish by re-enabling SIP.

I've followed all these instructions to the letter and now Wireless Setup Asst works, but Network Diagnostics keeps crashing on opening. Any idea why this would be?

Cannot believe Apple removed this great little app!

j

@jake, check the crash report, but you're probably missing:

/System/Library/Frameworks/NetworkDiagnosticsUI.framework

Copy it from a Sierra machine, paste it into the correct location & fix the permissions.

Wireless Diagnostics is not the same as Network Diagnostics. Go to /System/Library/CoreServices/Network Diagnostics.app. You will not find it in High Sierra. See my instructions on how to restore it (and the Network Setup Assistant) elsewhere in this thread.

Alas blanchr, I could not agree more; and I have been using Apple computer since the days of the old Apple II.

As an aside, I really don't care for the way that Apple is making my desktop look like a Macbook or iPad, but that is just me (guess that's why I use Terminal so much.)