Today a customer contacted me because he has upgraded his MacBook to MacOS X Sierra and since then, when trying to access a switch via SSH he got the message
Unable to negotiate with 10.XX.XX.XX port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1
The switch is a
Cisco 2960S running
IOS 12.2(55)SE7 (C2960S-UNIVERSALK9-M)
I looked at the command reference guide for this version, but was unable to find any command to configure SSH ciphers. (we can only configure SSH version 1 / 2 or both)
Is it possible with this version?
P.S. Yes I'm aware that he should use RSA key authentication, and upgrade the IOS version, I recommended it but this will need some testing and change management.