Error "Permission denied(publickey,gssapi-with-with-mic)" When connecting to Instance Using OPC user

Applies to:

Oracle Cloud Infrastructure - Version N/A and later

Linux x86-64

Symptoms

Unable to connect to instance getting error "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" when login in with opc user

Changes

Created a new user and added the following to /etc/ssh/sshd_config file

AllowUsers <USER>

Cause

AllowUsers should be followed by a list of all user or admin name patterns, separated by spaces.

In this case opc user is missing from the list

Solution

• Login to Serial console and single user mode following documents below

        https://docs.oracle.com/en-us/iaas/Content/Compute/References/serialconsole.htm