Gracias a todos
Os comento. El NAS lo tengo por capacidad y escalabilidad para aumentar tamaño a medida que vaya teniendo más contenido, no lo uso como servidor remoto porque no me interesa. Tengo muchas pelis en de 4K y musica SACD. Es la única solución que existe para no ir teniendo discos y mas discos y al final no saber donde está nada. Solo con eso ya amortizo
Puedo disfrutar de viernes a domingo y las demas capacidades del NAS no me interesan asi pues tenerlo conectado es un absurdo en mi caso. Como servidor de DLNA ya tengo lo que necesito
Lo de los cortes ya está solucionado. Era un problema interno de la finca y parece que solventado
Ya he tenido SAI y van muy bien pero por ahora no me planteo la compra del mismo

os muestro los ensayos y errores ( estamos cerca...)
Microsoft Windows [Versión 10.0.18363.592]
(c) 2019 Microsoft Corporation. Todos los derechos reservados.

C:\Users\MiniPC>
C:\Users\MiniPC>ssh 192.168.1.36 -l admin -pw pepito poweroff
Bad port 'w'

C:\Users\MiniPC>shh
"shh" no se reconoce como un comando interno o externo,
programa o archivo por lotes ejecutable.

C:\Users\MiniPC>ssh
usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]
[-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
[-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]
[-i identity_file] [-J [user@]host[:port]] [-L address]
[-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]
[-Q query_option] [-R address] [-S ctl_path] [-W host:port]
[-w local_tun[:remote_tun]] destination [command]

C:\Users\MiniPC>ssh 192.168.1.36 -l admin -w pepito poweroff
Bad tun device 'pepito '

C:\Users\MiniPC>ssh 192.168.1.36 -l admin -w pepito poweroff
Bad tun device 'pepito '

C:\Users\MiniPC>ssh 192.168.1.36 -l admin -p pepito poweroff
Bad port 'xxxxx '

C:\Users\MiniPC>ssh 192.168.1.36 -l admin pepito poweroff
ssh: connect to host 192.168.1.36 port 22: Connection timed out

C:\Users\MiniPC>ssh 192.168.1.36:5000 -l admin pepito poweroff
ssh: Could not resolve hostname 192.168.1.36:5000: Host desconocido.

C:\Users\MiniPC>ssh 192.168.1.36 -p 5000 -l admin pepito poweroff
ssh_exchange_identification: Connection closed by remote host

C:\Users\MiniPC>ssh 192.168.1.36 -p 5000 -l admin -pw pepito poweroff
ssh_exchange_identification: Connection closed by remote host

C:\Users\MiniPC>ssh 192.168.1.36 -l admin pepito poweroff -p 5000
ssh: connect to host 192.168.1.36 port 22: Connection refused

C:\Users\MiniPC>ssh 192.168.1.36 -p 5000 -l admin pepito poweroff
ssh_exchange_identification: Connection closed by remote host

C:\Users\MiniPC>ssh 192.168.1.36 -p5000 -l admin pepito poweroff
ssh_exchange_identification: Connection closed by remote host

C:\Users\MiniPC>ssh 192.168.1.36 -p 5000 -l admin pepito poweroff
ssh_exchange_identification: Connection closed by remote host

C:\Users\MiniPC>ssh 192.168.1.36 -l admin pepito poweroff -p 5000
ssh: connect to host 192.168.1.36 port 22: Connection refused

C:\Users\MiniPC>ssh 192.168.1.36 -l admin pepito poweroff -port 5000
ssh: connect to host 192.168.1.36 port 22: Connection refused

C:\Users\MiniPC>ssh 192.168.1.36 -l admin pepito poweroff port 5000
ssh: connect to host 192.168.1.36 port 22: Connection refused

C:\Users\MiniPC>ssh 192.168.1.36 -l port 5000 admin pepito poweroff
ssh: connect to host 192.168.1.36 port 22: Connection refused

C:\Users\MiniPC>ssh 192.168.1.36 -l port 5000 admin -pw pepito poweroff
ssh: connect to host 192.168.1.36 port 22: Connection refused

C:\Users\MiniPC>ssh 192.168.1.36 -l admin -pw pepito poweroff
Bad port 'w'

C:\Users\MiniPC>ssh 192.168.1.36 -l admin -p pepito poweroff
Bad port 'pepito '

C:\Users\MiniPC>ssh 192.168.1.36 -l admin -p 5000 pepito poweroff
ssh_exchange_identification: Connection closed by remote host

C:\Users\MiniPC>ssh 192.168.1.36 -l admin -p 5000 poweroff
ssh_exchange_identification: Connection closed by remote host

C:\Users\MiniPC>ssh 192.168.1.36 -l admin pepito -p 5000 poweroff
ssh: connect to host 192.168.1.36 port 22: Connection refused

( he sustituido mi contraseña real por pepito )