I ran across this cryptic error message in an SSH log file today:
Feb 7 03:33:21 hostname sshd: error: buffer_get_ret: trying to get more bytes 4 than in buffer 0 Feb 7 03:33:21 hostname sshd: fatal: buffer_get_int: buffer error
The problem is actually a corrupt line in a users ~/.ssh/authorized_keys file. This user had copy/pasted a new key into his authorized_keys file and it had a newline after the ssh-rsa. Strangely enough, people were still able to authenticate if their key was above the corrupted line. Users whose key was listed below the corrupt line were not able to log in.
7 thoughts on “SSH Error: trying to get more bytes 4 than in buffer 0”
Thanks! I hit this too. You are right – the error is very cryptic.
Thanks for this.
I never in a thousand years would have figured this out by myself – thanks!
SSH2 0: trying to get more bytes than in ssh_buffer in cisco switch error ….
This can also happen when known_host file is corrupted..
This happened for me when there was a rouge new line character in the known_host file on the CLIENT side
This can also happen if your key file permissions are not strict enough. In Linux, this command should fix it…
sudo chmod 600 ~/.ssh/id_rsa