The sshd pam setting is the one you want to make sure works because that
appears to link sshd access to valid system users for ssh access.
This is a link to my bog stock login. and any user I create (as a system
user) can access via SSH. except for root. but root cannot even log in at
this point.
Ubuntu Stock sshdconfig
<
https://drive.google.com/open?id=1VadPv7RzeJZQca89aTi5yIJ5F76V49_gkJ_vGgZCt9U>
On Tue, Oct 22, 2024 at 2:32 AM Rusty Carruth via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:
> 'for fun' I pasted the text of your email in to chatgpt, it had some
> interesting advice:
>
> *Verify User Exists*: - probably not your problem.
>
> *Check User's Shell*: Ensure that the user "default" has a valid shell. You can check the user's entry in /etc/passwd
> Good suggestion, imho, but you did imply you'd logged in as the user, so this is also (probably) a red herring.
> *Home Directory*: Ensure the user "default" has a home directory.
> *SSH Key/Password*: If you're trying to log in using SSH keys, ensure that the public key is correctly placed in /home/default/.ssh/authorized_keys and that the permissions are set correctly
> - since you've not logged in via SSH, this is probably also a herring.
> However, the suggestion: If you’re using password authentication, make sure the user has a password set Might be helpful.
> I'm skipping firewall suggestion.
> *Log Files*: Since /var/log/faillog is empty, also check /var/log/auth.log for any messages related to SSH login attempts
> - very good idea.
> Three's more, but I'm guessing the log files are the most likely place to start, after the suggestions everyone else gave.
>
> On 10/21/24 23:22, Rusty Carruth via PLUG-discuss wrote:
>
> The other questions are all great, but can you ssh from the server to
> itself as the desired user? That is, ssh theSSHdude@localhost , which
> should hopefully rule out network issues ;-)
>
> I'll also mention that I had a weird issue with SSH where I could ssh from
> machine A to machine B, but not from B to A! THAT turned out to be a
> netmask issue! And ChatGPT ALMOST got the answer. You could try your
> favorite AI to see if it can help, but be sure to give it more info than
> you think you should - I should have given it the output of ifconfig on
> both computers and it probably would have caught it....
>
> On 10/21/24 18:46, Keith Smith via PLUG-discuss wrote:
>
> Hi,
>
> I am a little stuck.
>
> I am trying to configure a user that will allow me to log into an Ubuntu
> 24.04lts server via SSH.
>
> I created a line : "AllowUsers default" in /etc/ssh/sshd_config
>
> Then sudo systemctl restart ssh
>
> Try to login and get "client_loop: send disconnect: Broken pipe"
>
> sudo tail /var/log/faillog returns nothing.
>
> I can SSH into the server from my Kubuntu desktop under the default user
> created during server o/s install
>
> A search says it is probably a network issue. Does not make sense given I
> can SSH in using another user.
>
> Any thoughts are much appreciated.
>
> Keith
>
>
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--
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.
Stephen
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