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ddwrt router build 18946 upgrade ssh broken

Posted by d33pa on Feb 27, 2014 in Support

It seems that as of version 17xxx the guys are DD-WRT switched from OpenSSH to Dropbear. No big deal really, except the SSH keys are not compatible with each other, thus preventing SSH from running.

To fix SSH:

    • Enable Telnet
    • Telnet into your router and run the following commands:
      1. cd /tmp/root/.ssh/
      2. rm authorized_keys
      3. rm ssh_host_dss_key
      4. rm ssh_host_rsa_key
      5. nvram unset sshd_rsa_host_key
      6. nvram commit
      7. reboot

Once the Router Restarts, SSH should be working, and when you try to login, you will get a prompt to accept the new Key Generated by DropBear

Props to Pinchiis blog for the how-to

Pinchii’s Blog ยป build 18946.

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