Linux Basics

Unable to negotiate with port 22: no matching key exchange method found.

January 4, 2022
2 Min Read
no matching key exchange method found
no matching key exchange method found

Unable to negotiate with <IP> port 22: no matching key exchange method found.

Sometimes you have met with the following error while you are trying to SSH to a server.

Unable to negotiate with 192.168.1.10 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

You can solve this by using the following command:

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 root@192.168.1.10
Or you can permanently add the following to the ssh client configuration (.ssh/config) file:

Host 192.168.1.10
    KexAlgorithms +diffie-hellman-group1-sha1

For example:

Edit/Create the SSH client configuration file using your favorite editor
vim $HOME/.ssh/config

and add the following into it:

Host 192.168.1.10
    KexAlgorithms +diffie-hellman-group1-sha1

OpenSSH website has a page dedicated to this. Please read it here. This will give you some important information about the older algorithms.

That’s it!

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