Solved: [HELP] Oracle Cloud ARM Instance Locked Out After Editing sshd_config — Serial Console Login Immediately Resets

🚀 Executive Summary TL;DR: Oracle Cloud ARM instances can become inaccessible after sshd\_config errors, with the serial console failing due to its reliance on a local SSH session. Recovery involves using OCI’s Run Command, detaching and mounting the boot volume on a rescue instance, or, ideally, terminating and rebuilding the instance with automation. 🎯 Key Takeaways The OCI Serial Console attempts a local SSH session, not a direct TTY, which causes it to immediately reset if the sshd daemon is misconfigured or fails to start. OCI’s ‘Run Command’ feature provides a quick recovery method by executing scripts as root on the instance via the Oracle Cloud Agent, bypassing the need for SSH login. The ‘Boot Volume Shuffle’ is a universal recovery technique involving detaching the broken instance’s boot volume, attaching it to a temporary ‘rescue’ instance, and directly editing the sshd\_config file before re-attaching it. Locked out of your Oracle Cloud (OCI) ARM instance after a bad sshd_c