So, I was messing around with PS1 prompts on my QNAP TS-409 Pro and decided to add it into the .bash_profile. The shell wasn’t BASH so I edited the /etc/passwd to change it, however in my haste I hit save and quit with the shell being /etc/bas - missing an h. The result is you cannot login via SSH. As only the admin user can login remotely this is a bit of an issue. A lot of frantic Googling led me to a post on the QNAP forum with a guide on how to fix it. I’m going to repeat these steps here as well with my modifications. I have a 4 disk RAID5 and what I noticed was that when I hot plugged all 4 drives back in the array rebuilt itself and basically kicked me off again. — Shutdown the system and remove all drives — Boot, login using telnet to port 13131 (ensure you enable this via the web ui before shutdown) — Hot plug 3 of the 4 drives (assuming RAID5) — Assemble the system RAID partition:
# mdadm -A /dev/md9 /dev/sda1 /dev/sdb1 /dev/sdc1 --run # mkdir /mnt/HDA_ROOT # mount /dev/md9 /mnt/HDA_ROOT # cd /mnt/HDA_ROOT/.config
— edit the passwd file and correct any mistakes
# halt (shuts the unit down)
— plug in 4th drive — power up Turns out I hadn’t noticed the .profile file which I could have changed and saved a world of pain!