## after B2: spike-r436 still there (the 'rm -rf' through the forced key ran rclone, not rm)
$ password p23: ls
felhom-repo
spike-r436
[rc=0]

## port 22 controls
$ plain p22: sftp ls .ssh
u629488-sub4@u629488-sub4.your-storagebox.de: Permission denied (publickey,password).
Connection closed
[rc=255]

$ password p22: sftp ls .ssh (stdin batch)
Connected to u629488-sub4.your-storagebox.de.
sftp> ls -la .ssh
drwx------    2 u629488-sub4 u629488         3 Sep 16 16:02 .
drwxr-xr-x    6 u629488-sub4 u629488         6 Oct  3 11:20 ..
-rw-------    1 u629488-sub4 u629488       510 Oct  3 11:19 authorized_keys
sftp> bye
[rc=0]

## B2 port forward, positive test: open -L, then try to use it
$ connect through the forward
[rc=0]

ssh -L log:
channel 1: open failed: administratively prohibited: open failed
