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public putty key not working on fedora 25

asked 2017-01-10 10:45:33 -0600

afodata gravatar image

I use putty authentication agent (pageant) and a private/public key combo to log into various fedora servers. This simple process has worked fine for many years up until I tried it on fedora 25. I cannot figure out why my key is not working. There is no useful information in the messages log. Just ...

Jan 10 10:34:40 servername audit: USER_LOGIN pid=4209 uid=0 auid=4294967295 ses=4294967295 msg='op=login acct="root" exe="/usr/sbin/sshd" hostname=? addr=x.x.x.x terminal=ssh res=failed'

Thanks in advance for any help on this matter.

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What is the output of systemctl status sshd in Fedora?

Axel Sommerfeldt gravatar imageAxel Sommerfeldt ( 2017-01-12 04:35:37 -0600 )edit

โ— sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled) Active: active (running) since Tue 2017-01-10 10:34:14 CST; 2 days ago Docs: man:sshd(8) man:sshd_config(5) Process: 4205 ExecStart=/usr/sbin/sshd $OPTIONS (code=exited, status=0/SUCCESS) Main PID: 4206 (sshd) Tasks: 1 (limit: 4915) CGroup: /system.slice/sshd.service โ””โ”€4206 /usr/sbin/sshd

afodata gravatar imageafodata ( 2017-01-12 18:35:01 -0600 )edit

Is there any option to enable verbose log in Putty? Otherwise I would try to export the private key in openssh format (AFAIK the Putty key editor can do this), install this in a Linux workstation (e.g. booted from a Live-USB), and try to connect to Fedora 25 with "ssh -vvv <user>@<ip>". Using "-vvv" will give you verbose log output which could give us a clue what is going on.

Axel Sommerfeldt gravatar imageAxel Sommerfeldt ( 2017-01-13 01:17:42 -0600 )edit

I don't have a problem connecting via ssh, so I am sure there will be no errors if I do an ssh connection. A normal ssh connection via command line does not use a public key. It uses password exchange. The problem is with putty using pageant to authenticate my public key. - per your suggestion, I turned on putty logging but it was empty ... apparently the problem is with the server or pageant. - per your suggestion, I exported the key in open ssh format but then pageant could not read it

afodata gravatar imageafodata ( 2017-01-13 08:59:17 -0600 )edit

I must confess I'm confused. As far as I have understand you, you have a Fedora 25 server setup with public/private key SSH authentication. You are not able to log into this server via Putty, and Putty is not a big help to find out why. So my idea was to use a Linux distribution instead of Windows, and using command line ssh instead of Putty, since ssh offers more hints what is going wrong when used with option -vvv. Now you write "ssh connection via command line does not use a public key". I thought that your Fedora 25 server is actually set up to use public/private key authentication?

Axel Sommerfeldt gravatar imageAxel Sommerfeldt ( 2017-01-14 07:44:44 -0600 )edit

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answered 2017-07-11 10:57:26 -0600

jjelen gravatar image

There is not enough information in the question to answer the question. Please, turn on debug logs in the server (write LogLevel DEBUG3 into /etc/ssh/sshd_config, restart the sshd service systemctl restart sshd) and try to connect once more. Then have a look into the /var/log/secure and post the logs.

Hopefully, you will be able to get why it failed, if not, let me know and I will be able to get more details from that logs.

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Asked: 2017-01-10 10:44:41 -0600

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Last updated: Jan 10 '17