KexAlgorithms

Various problems with legacy SSH systems

 in Bash / GNU/Linux  tagged diffie-hellman-group1-sha1 / HostKeyAlgorithms / KexAlgorithms / ssh / ssh-dss by

Case 1

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ssh root@192.168.1.1;
Unable to negotiate with 192.168.1.1 port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1

We solved this problem using the following command:

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ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 root@192.168.1.1;

Case 2

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ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 root@192.168.1.1;
Unable to negotiate with 192.168.1.1 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss

We solved this problem using the following command:

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ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 -oHostKeyAlgorithms=+ssh-dss root@192.168.1.1;