this post was submitted on 20 Oct 2023
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SSH suddenly not working? (alien.top)
submitted 11 months ago by [email protected] to c/[email protected]
15 comments fedilink hide all child comments
 

I have two machines, one is Windows 11 and my server is running Debian 12. SSH has run fine on both machines up until recently. Whenever i try to SSH into my server, it will reject the password (which is undoubtedly correct), and after a few failed attempts it will give me an error that says "Permission denied (publickey,password)." I can SSH into the server completely fine on my other devices, so the problem has to lie within my Windows machine. Since I last used SSH, the only notable things that have happened were that I installed (and soon after uninstalled) the OpenSSH server for Windows, and yesterday an internet outage happened that left me without internet for a full day. This morning, the router was reset and I've ensured that both machines are connected.

If this is the wrong sub to be posting this on, I'd appreciate if someone were to kindly point me to a correct sub on which I could repost.

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[–] [email protected] 1 points 11 months ago

did you try a different client? maybe try removing the cert or make sure that the Credential Manager control panel doesn't have any entries for that system

[–] [email protected] 1 points 11 months ago (1 children)

What software are you using to SSH from Windows?

[–] [email protected] 1 points 11 months ago (1 children)

I'm using default terminal, but I've tried connecting from putty as well and it didn't work.

[–] [email protected] 1 points 11 months ago (1 children)

You got Fail2Ban installed on your Linux host? Has it possibly banned your Windows IP?

[–] [email protected] 1 points 11 months ago

I've installed Fail2Ban before on this machine, but I've since uninstalled it. I've also checked sudo-iptables, and it doesn't show any rejected IPs.

[–] [email protected] 1 points 11 months ago

systemctl stop ssh&&/usr/sbin/sshd -ddd on the server, then try again

[–] [email protected] 1 points 11 months ago (1 children)

Is is possible that Windows passkey is being used? Did you remove all traces of the sshd install. Also if your using Windows Terminal try putty.

Note the order of "(publickey,password)". I'm gonna guess publickey is being used before password.

Certainly seems like a Windows (client) problem and not a server problem.

[–] [email protected] 1 points 11 months ago

How would I go about removing the sshd install traces? I just used the powershell command for uninstalling the server that was provided in this page (but this wouldn't be the first time Microsoft has screwed me over.): https://learn.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse

I've tried putty, it hasn't worked.

[–] [email protected] 1 points 11 months ago (1 children)

Check your logs /var/log/auth.log. You can pipe grep it to search by IP or just try to connect then quickly check. That might give you more insight that isn't being provided to the remote client (windows).

[–] [email protected] 1 points 11 months ago (1 children)

Doesn't seem like there are any logs.

[–] [email protected] 1 points 11 months ago

Check storage if it’s full, if it cannot audit your login it won’t let you.

[–] [email protected] 1 points 11 months ago (2 children)

When you say your Windows machine is getting an external ip, is it an actual external ip or that it's the 169 address that your machine gets when it can't speak to your dhcp server?

Can you access the Internet or any other services on your Windows machine?

[–] [email protected] 1 points 11 months ago

Fwiw he wouldn't get a public key password denied type error if he wasn't able to at least reach the target, to my knowledge.

[–] [email protected] 1 points 11 months ago

It was my actual external IP.

I could access the internet and everything just fine, but when I tried to connect to Jellyfin or anything that my other machine is running it wouldn't work. The issue is resolved now.

[–] [email protected] 1 points 11 months ago

Connect with more v(erbose) output to your server. Example:

ssh -vvvv @

... and read line by line.