Ssh no longer works on my Channels DVR RPi 4 instance

Channels DVR Server Raspberry Pi
#1

Hello,

I am using the RPi 4 Channels DVR image and need to ssh into it to remove a file /mnt/data/channels-dvr/data/chromedata/YouTubeTV/SingletonLock which is preventing Discovery channels from working. I have the latest version of the image - 2023.0108.2341. I'm

I have used ssh in the past with the RPi but have since turned it off via the web UI.

My RSA keys in id_rsa/id_rsa.pub have not been changed since 2019 but today when I turned on ssh via the web UI and copied my public key and tried to ssh into the RPi I just get a connection closed message.

I'm not sure what has changed. I am ssh'ing from a Mac and periodically update to the last macOS versions, but I can't imagine anything in ssh have changed.

I've also tried generating new keys with different algorithms, even the default, but still get a connection closed message. Also have tried connecting with dvr-server.local and IPv4 address.

I did add -v to ssh and see a debug message in the log:
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

I did some searching but didn't find anything helpful related to that message.

Finally, because it's an external drive, I was hoping I could mount it on my Mac but unfortunately it can not "see" /mnt, only the /DVR partition.

My next step is to back up /DVR and start with a fresh install of CDVR but am hoping that I'm doing something silly that someone can point out. When I paste the public key I am pasting the whole string.

Thanks for any help!

David

#2

It's possible RSA keys are not secure enough and being rejected now

Rebooting should be enough to fix the SingletonLock issue. That's not just a file it's usually an open OS flock

#3

Thanks, I tried ssh from another computer and it worked. Not sure why I can ssh from my Mac anymore.

For whatever reason rebooting did not remove the file. Once sshed into the CDVR I was able to remove the file and could rescan Discovery. However, I'm getting auth errors on the other Discovery channels.

David

#5

I wanted to circle back on the two issues that I've been having with the RPi 4 image.

I've managed to solve the SingletonLock issue. Rebooting alone did not fix it. I removed my sources that use Chrome - both YTTV and Pluto. After a reboot I added back both sources and the SingletonLock issue is gone.

However, I'm stumped on the ssh issue. I was able to ssh from a different computer using a rsa key, once. But now I am not able to anymore from any computer in the house. I've tried rsa, ecdsa and ed25519 and nothing works.

SSH is not too big a deal but I did use it to run the Pluto for Channels docker and if I ever need to update it then I'll need to reinstall the RPi 4 image.

#6

IIRC, macOS changed which algorithms it would connect with, needing more secure ones than previously. I believe you can change your local SSH config to allow the less secure algorithms.

(I think so had to do this with a particular Ventura update.)