SSH Remote Access Authentication Tips
Tags: Authentication, Linux, permission, SSH, Tips
My friend was try to setup Linux SSH public key authentication without password and he’s keep getting password prompt. I will not going to go through how to setup SSH public key authentication here and I just would like to share few troubleshoot tips in order to fix the similar problem here:
1. Checking /var/log/messages file
Basically SSH hints are written to “/var/log/messages” file, you should be able to see any error messages here. For an example “Authentication refused: bad ownership or
modes for directory /root cannot set to 775“. Perhaps you’re require to change /root folder permission to make it work (may apply to other /home folder as well).
Type #chmod 755 /root or #chmod 700 /root can solve authentication problem.
2. Permissions
Please make sure you have correct file and folder permission as suggested below.
.ssh folder permission 700 (rwx——)
authorized_keys 600 (rw——-)
id_rsa 600 (rw——-)
id_rsa.pub 600 (rw——-)
id_dsa 600 (rw——-)
id_dsa.pub 600 (rw——-)
Good luck
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