In the file, add the following lines: KexAlgorithms diffie-hellman-group1-sha1, ,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 You can replace nano with vim or other text editors you like to use. Begin by issuing the following command: nano /etc/ssh/ssh_config Enabling older key exchange method can be done by adding a specific line to the OpenSSH configuration file. Their offer: diffie-hellman-group1-sha1įortunately, fixing the error is not that hard to do. Unable to negotiate with 123.123.123.123 port 22: no matching key exchange method found.
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