Debian ssh issue after Buster upgrade

Question

After I upgrade my laptop to Buster (stable) from Stretch (old Stable) I get the following error while I try to connect to my remote workstation:

ssh workstation sign_and_send_pubkey: signing failed: agent refused operation [email protected]'s password:

If I type the password I'm able to remotely login. The remote machine run Debian Stretch.

I'm no longer able to connect remote machine from nautilus getting this error:

Oops! Something went wrong. Don't have permission to access the requested location

Maybe the two problems are related.

Have you tried launch a new SSH agent? Alternatively, rebooting the computer? — 41754
– 41754, Commented Jul 22, 2019 at 7:57
I have upgraded and rebooted both the laptop and the workstation but the problem persist — Riccardo
– Riccardo, Commented Jul 22, 2019 at 9:20
Create a new SSH agent and assoc it by eval $(ssh-agent), then repeat the CLI ssh, read the failure, add the key by ssh-add /PATH/TO/THE/KEY, try ssh again, read the failure again. This might hint you the problem. You might then repeat all of those using increased verbosity. — 41754
– 41754, Commented Jul 22, 2019 at 9:26
I tried to resend the key to the client with no luck. I get the same error — Riccardo
– Riccardo, Commented Jul 22, 2019 at 9:48
Is your SSH authentication key very old? Try creating a new key; perhaps the old one is too short to be secure by modern standards, or has some other known flaw. — telcoM
– telcoM, Commented Jul 22, 2019 at 9:52

Riccardo · Accepted Answer · 2019-07-22 10:28:19Z

Found the solution here

In particular, the way to solve it is to make sure that I have the correct permission on the id_rsa and id_rsa.pub.

Check the current chmod number by using stat --format '%a' <file>. It should be 600 for id_rsa and 644 for id_rsa.pub.

To change the permission on the files use

chmod 600 id_rsa chmod 644 id_rsa.pub

That solved my issue with the update.

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