Cannot edit server.cfg

[horseman67]

Hi,

So I’m following the instructions here: https://kb.nomachine.com/AR02L00785 on how to allow only public key auth with NoMachine.

However, when i try to edit /Applications/NoMachine.app/Contents/Frameworks/etc/server.cfg

and update it with the line: AcceptedAuthenticationMethods NX-private-key

I get ‘permission’ denied errors – note I am doing this as ROOT but I’m still unable to modify the file.

Is NoMachine doing something strange with permissions or metadata? I’m really unable to edit this file even as root – very odd.

How do i do this so that i can set key only auth?

Thanks!

[Britgirl]

Please check that you actually have sudo privileges.

Open a terminal and from CLI try to edit the file, for example with vim:

sudo vim /Applications/NoMachine.app/Contents/Frameworks/etc/server.cfg

or just use command:

sudo sed -i '' -e 's/^AcceptedAuthenticationMethods.*/AcceptedAuthenticationMethods NX-private-keytest/' "/Applications/NoMachine.app/Contents/Frameworks/etc/server.cfg"

This will change the key to:

AcceptedAuthenticationMethods NX-private-key

[horseman67]

Thanks, but i’m 100% running this as root – there is some other strange setting nomachine has set (some SIP related thing?) that makes the files inaccessible even as root.

Here’s the result of your command, you can see i’m running as root. I don’t have this problem with any other app, only NoMachine – my friends who also have NoMachine installed on mac get the same issue.

/Applications/NoMachine.app/Contents/Frameworks/etc » sudo sed -i ” -e ‘s/^AcceptedAuthenticationMethods.*/AcceptedAuthenticationMethods NX-private-keytest/’ “/Applications/NoMachine.app/Contents/Frameworks/etc/server.cfg”

Password:

sed: /Applications/NoMachine.app/Contents/Frameworks/etc/server.cfg: Operation not permitted

[zaq]

Hello Horseman67,

You need to grant Terminal.app ‘Full Disk Access’. Go to

‘System Settings’ -> ‘Privacy & Security’ -> ‘Full Disk Access’

and then reopen Terminal.app and run:

sudo sed -i -e
"s/^AcceptedAuthenticationMethods.*/AcceptedAuthenticationMethods
NX-private-keytest/"
/Applications/NoMachine.app/Contents/Frameworks/etc/server.cfg 

[Britgirl]

I just noticed a typo in the previous command I wrote, apologies for that. It should have been

sudo sed -i '' -e 's/^AcceptedAuthenticationMethods.*/AcceptedAuthenticationMethods NX-private-key/' "/Applications/NoMachine.app/Contents/Frameworks/etc/server.cfg"

[horseman67]

@zaq

Thanks that worked! Giving “full disk access” did it! I think this should be in the instructions!!!

[Author]

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