because you are working on has been modified since the last time you saved it, you will be prompted to save the file first. To quit nano, use the Ctrl-X key combination. KexAlgorithms +diffie-hellman-group1-sha1,diffie-hellman-group14-sha1 Locate the line ‘ # Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc’ and remove the Hash/Pound sight from the beginning.
Locate the line ‘ # MACs hmac-md5,hmac-sha1, remove the Hash/Pound sight from the beginning, and add the extra hashing algorithm that I’ve shown above in red. Open a terminal windows and execute the following So until they re all updated I’m going to need to re-enable SHA1. Which is fine, but all my clients Cisco Firewalls, Routers, Switches are probably all using RSA/SHA1. SHA1 is weak, so support for it has been removed. Not Apple’s fault to be fair, it’s OpenSSH version 7. But I will include it at the end of the article, for the more security conscious of you. routers and switches so that method is a little unwieldy for me. The preferred fix, is to create a new file in your own home folder, with the connection settings for EACH SSH CONNECTION. It has been ( correctly) pointed out, that this is the ‘ least preferred‘ method, as it will allow these less sure methods for ALL SSH connections. WARNING: My usual fix for this is to edit the macs ssh_configfile directly and allow the older ( less secure) connection methods. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1 Mac SSH Error – Fix Unable to negotiate with x.x.x.x.1 port 22: no matching key exchange method found. Update 08/12/21: With newer Cisco equipment you may see the following error Unable to negotiate with x.x.x.x port 22: no matching MAC found Their offer: hmac-sha2-256
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