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When a tunnel client reconnects, the sentinel was allocating a new loopback IP (e.g., 127.0.0.23 → 127.0.0.27) while sshpiper config still referenced the old IP, causing SSH "Permission denied" errors until the next key sync cycle (30-60s window). Now reuse the same loopback IP for the same spot ID across reconnects, eliminating the stale sshpiper config window. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Two issues prevented `ssh user@host "command"` from working: 1. containarium-shell only checked SSH_ORIGINAL_COMMAND (set by ForceCommand), but sshpiper forwards exec requests as `shell -c "command"`. Now handles both the -c argument and SSH_ORIGINAL_COMMAND. 2. sshpiper's authorized_keys parser stopped at blank lines, never reaching the user's key. keysync now strips blank lines and comments before writing. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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