AutoRemote no matching key exchange method found [preauth]

Hi all hopefull something stupid i have done with a easy fix i have had automremote working on this pc and have one on my vps working now but i tried to use the one on this PC again and it wasnt doing anything checked the auth logs on the PC and im getting the following message ?
I can ssh from other devices using password login
fatal: ssh_dispatch_run_fatal: Connection to 192.168.2.153: no matching key exchange method found [preauth]

get the same error trying to run a command on this PC from both my phone and tablet, any idears ?

thanks pete

 

Nope not that I'm aware of unless a recent update changed it?

 

well I fixed it time will tell what the fix breaks but ...
I needed to add this:
KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
to the file:
/etc/ssh/sshd_config
and restart the service, I have to admit I have no clue what that line does or what implication adding that line has so kids dont try this at home unless someone who knows what they are talking about can say its a good idea

pete