Unable to SSH to DevNet Sandbox devices from Ubuntu Linux

[mikejensen83]

Hello,

I am trying to SSH to always on IOS XE devices in the DevNet sandbox with Ubuntu Linux as I try to learn Python.

I receive the following error when I try and connect to any of them:

tiate with 131.226.217.149 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1

I have editing the ssh_config file in /etc/ssh/ssh_config to add:

KexAlgorithms diffie-hellman-group1-sha1,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
Ciphers 3des-cbc,blowfish-cbc,aes128-cbc,aes128-ctr,aes256-ctr

but I can't no matter what I do ssh_config is not editable.

Any help is greatly appreciated as I am kind of at a standstill in my learning until I get this resolved.  Thank you.

[Marcel Zehnder]

Try to edit ~/.ssh/config, instead of /etc/ssh/ssh_config:

echo KexAlgorithms=+diffie-hellman-group14-sha1 >> ~/.ssh/config

HTH

[mikejensen83]

Hello,

I ran echo KexAlgorithms=+diffie-hellman-group14-sha1 >> ~/.ssh/config and this is the response I get now on a SSH attempt:

ssh developer@sandbox-iosxe-recomm-1.cisco.com
Unable to negotiate with 131.226.217.149 port 22: no matching host key type found. Their offer: ssh-rsa

I am thinking I need to generate new host keys but have been unsuccessful so far.

[bigevilbeard]

I had this problem, instead i use the other one, same username/password.

ssh developer@sandbox-iosxe-latest-1.cisco.com
(developer@sandbox-iosxe-latest-1.cisco.com) Password:

"Hello there! Hoping you are having a great day
... Welcome to 'csr1000v-1',
 your favorite CISCO.IOS.IOS Sandbox"


csr1000v-1#

[SergiokU]

Thanks Buddy, and what password did you use to connect?

[bigevilbeard]

@SergiokU the username and password provided in the sandbox.

Hope this helps.