Invalid option --
Dropbear server v2026.94 https://matt.ucc.asn.au/dropbear/dropbear.html
Usage: /usr/bin/dropbear [options]
-b bannerfile	Display the contents of bannerfile before user login
		(default: none)
-r keyfile      Specify hostkeys (repeatable)
		defaults:
		- rsa /etc/dropbear/dropbear_rsa_host_key
		- ecdsa /etc/dropbear/dropbear_ecdsa_host_key
		- ed25519 /etc/dropbear/dropbear_ed25519_host_key
-D		Directory containing authorized_keys file
-R		Create hostkeys as required
-F		Don't fork into background
-e		Pass on server process environment to child process
-E		Log to stderr rather than syslog
-m		Don't display the motd on login
-w		Disallow root logins
-G		Restrict logins to members of specified group
-s		Disable password logins
-g		Disable password logins for root
-B		Allow blank password logins
-t		Enable two-factor authentication (both password and public key required)
-T		Maximum authentication tries (default 10)
-j		Disable local port/stream forwarding
-k		Disable remote port/stream forwarding
-a		Allow connections to forwarded ports from any host
-c command	Force executed command
-p [address:]port
		Listen on specified tcp port (and optionally address),
		up to 10 can be specified
		(default port is 22 if none specified)
-P PidFile	Create pid file PidFile
		(default /var/run/dropbear.pid)
-l <interface>
		interface to bind on
-i		Start for inetd
-W <receive_window_buffer> (default 24576, larger may be faster, max 10MB)
-K <keepalive>  (0 is never, default 0, in seconds)
-I <idle_timeout>  (0 is never, default 0, in seconds)
-M <max_duration>  (0 is off, default 0, in seconds)
-z    disable QoS
-Q    <algo>   Print supported algorithms, or -Q help
-V    Version