Sshd not starting after update

[miketuxedoo]

Hi all, after the latest Manjaro-Update ( it was around 27. of Januray ), i couldn’t connect via ssh to my server anymore. Trying to connect fails with message “PRNG is not seeded”.
Then I tried to start sshd manually with sudo systemctl start sshd.service, but it fails with the error number 255.
I searched some hours, but didn’t find an actual result for this. It seems I’m the only one who has this problem actually!?

I fixed it temporary by going back with timeshift, prior to the update.

Is this a generell known problem which manjaro developers are aware of, or could this be only on my mashine?

[Mirdarthos]

Hi @miketuxedoo, and welcome!

Please post the output of:

sudo systemctl status sshd.service

---

Tip:

When posting terminal output, copy the output and paste it here, wrapped in three (3) backticks, before AND after the pasted text. Like this:

```
pasted text
```

Or three (3) tilde signs, like this:

~~~
pasted text
~~~

This will just cause it to be rendered like this:

Sed
sollicitudin dolor
eget nisl elit id
condimentum
arcu erat varius
cursus sem quis eros.

Instead of like this:

Sed sollicitudin dolor eget nisl elit id condimentum arcu erat varius cursus sem quis eros.

Alternatively, paste the text you wish to format as terminal output, select all pasted text, and click the </> button on the taskbar. This will indent the whole pasted section with one TAB, causing it to render the same way as described above.

Thereby increasing legibility thus making it easier for those trying to provide assistance.

For more information, please see:

@Fabby

On this forum here you need to have Trust Level 1 (=TL1) to be able to post screenshots and links in-line.

That’s dumb! Why is that?

Well, that’s because on our old forum we got tons of screenshots of text, links to SPAM, PR0N and other things you don’t want on a forum, so all the new users are prohibited from posting links and pics because of a few bad actors.

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Additionally

If your language isn’t English, please prepend any and all terminal commands with LC_ALL=C. For example:

LC_ALL=C bluetoothctl

This will just cause the terminal output to be in English, making it easier to understand and debug.

[linux-aarhus]

I use ssh daily to various servers - no issues - so

@miketuxedoo

could this be only on my mashine?

Yes and no and perhaps. It depends on the kernel in use.

The message PRNG is not seeded seeems to indicate an issue with entropy.

Search the forum for entropy

Low entropy on my system

I run kernel 5.10; since this kernel I always had a good level of entropy (about 3000), but since some system udpate ago entropy’s level has become very low (256). cat /proc/sys/kernel/random/entropy_avail 256 I know haveged, but won’t run because require kernel 5.4 or lower; I also know Rng-tools but doesn’t help (entropy remains lower to 256): So ATM I don’t have haveged nor rng-tools installed. Here Rng-tools - ArchWiki they suggests: A simple test to see if everything is working as it…

[miketuxedoo]

Ah ok, i will do it right next time

To get the error and a meaningful terminal output, I need to do the current outstanding update, but as this is my working mashine that i need, of course to work with ssh, i have to update at a later time to reproduce the error.

[andreas85]

Please install 2 kernels (one of them LTS)

Manjaro Kernels

This may help to prevent rollbacks in some cases

[miketuxedoo]

Today I tried one more time to update to reproduce the problem, but after this update, the probelm didn’t occure. IMO it has to do something with the update, because i didn’t touch anything related to ssh.

Thanks for your suggestions anyway!

This can be closed now