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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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why can't I connect to my ssh server UNLESS I enter eval "$(ssh-agent -s)" first? (lemmy.dbzer0.com)

submitted 4 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]

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I have my own ssh server (on raspberry pi 5, Ubuntu Server 23) but when I try to connect from my PC using key authentication (having password disabled), I get a blank screen. A blinking cursor.

However, once I enter the command eval "$(ssh-agent -s)" and try ssh again, I successfully login after entering my passphrase. I don't want to issue this command every time. Is that possible?

This does not occur when I have password enabled on the ssh server. Also, ideally, I want to enter my passphrase EVERYTIME I connect to my server, so ideally I don't want it to be stored in cache or something. I want the passphrase to be a lil' password so that other people can't accidentally connect to my server when they use my PC.

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[–] [email protected] 4 points 4 months ago* (last edited 4 months ago) (1 children)

I'm not sure which logs I can and should check, but when I listen to this: sudo tail -f /var/log/auth.log

I only get this right after I ctrl+C on my blank / blinking cursor screen. (Did this 3 times in a row.)

2024-08-14T11:35:32.874228+02:00 pidoos sshd[3957]: Connection closed by authenticating user pi MY_PUBLIC_IP port 52242 [preauth]
2024-08-14T11:35:50.168160+02:00 pidoos sshd[3975]: Connection closed by authenticating user pi MY_PUBLIC_IP port 39266 [preauth]
2024-08-14T11:35:55.236347+02:00 pidoos sshd[3987]: Connection closed by authenticating user pi MY_PUBLIC_IP port 41318 [preauth]

Where MY_PUBLIC_IP is redacted. I'm not even sure why my public IP is showing. I connect locally. But ports are forwarded, yes.

Using sudo journalctl -u sshd -f does not seem to output anything...

[–] gedhrel 2 points 3 months ago

That's only part of the handshake. It'd require agent input around that point.