SSL and Ciphers on my Synology DiskStation

 Whilst tinkering with my Synology DS-414 Network Attached Storage (NAS), I was trying/failing to SSH into the box: -

ssh -p 8822 admin@diskstation

I was seeing: -

Unable to negotiate with 192.168.1.17 port 8822: no matching cipher found. Their offer: aes128-cbc,3des-cbc,aes192-cbc,aes256-cbc

Thankfully this is easy to mitigate - I merely needed to see what ciphers my Mac had: -

ssh -Q cipher

3des-cbc

aes128-cbc

aes192-cbc

aes256-cbc

rijndael-cbc@lysator.liu.se

aes128-ctr

aes192-ctr

aes256-ctr

aes128-gcm@openssh.com

aes256-gcm@openssh.com

chacha20-poly1305@openssh.com

and then choose my favourite: -

ssh -p 8822 -c aes256-cbc admin@diskstation

admin@diskstation's password: 

admin@DiskStation:~$ 

Once I added my SSH public key: -

vi ~/.ssh/authorized_keys 

I was off to the races !