Troubleshooting

kdev doctor        # every dependency, account token, the workspace and the tunnel's DNS
kdev -v status     # the same command, with each Kaggle API call logged
kdev logs          # what the box itself is saying

you see	what to do
… is not signed in	kdev account add <name> refreshes that account
ssh does not answer right after starting	give Cloudflare a minute; kdev ssh
The session never reported a tunnel	kdev logs; the message names the command to stop it
Only X can cancel session …	sign X in (kdev account add) or stop it in the Kaggle UI
Not all your files are back yet	kdev restore finishes it
your last box is still saving your files	nothing: kdev up waits, then starts
… has a session kdev cannot reach	someone is using the notebook in the Kaggle editor