Note: on Unix-based systems like OS X, the tilde character (~) references the user's home directory. WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! the command: ssh-keygen -R to clear the old fingerprint, and then try connecting again.Īlternatively, remove the specific host entry fingerprint in ~/.ssh/known_hosts (or remove the file). If an SSH connection is refused with the following error, the fix is to update the offending fingerprint. The 'diffie-hellman-group1-sha1' algorithm is used on most Cisco routers, firewalls and switches, so may be added to 'all hosts'. This example only allows 'diffie-hellman-group1-sha1' for a specific host, and sets a default username - connect with ssh cs1k ![]() KexAlgorithms +diffie-hellman-group1-sha1Ī 'better' solution is to create ~/.ssh/config with those two lines, or better yet, applied more specifically: # settings for all hostsĬiphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc Their offer: ssh-dssĮnter the command: sudo nano /etc/ssh/ssh_config and add the following two lines to the end of the file: HostkeyAlgorithms +ssh-dss Their offer: diffie-hellman-group1-sha1 Unable to negotiate with x.x.x.x port 22: no matching host key type found. /rebates/&252fftp-client-for-mac-el-capitan. Unable to negotiate with x.x.x.x port 22: no matching key exchange method found. ![]() If an SSH connection is refused with one of the following errors, the fix is to re-enable them in ssh_config. Sierra (macOS 10.12) uses OpenSSH v7.2 (El Capitan used OpenSSH v6.9) which no longer supports some of the older, less secure algorithms by default.
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