Old Cisco ssh login
Connect via ssh with old algorythm

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1

Also there can be fail with

Unable to negotiate with port 22: no matching host key type found. Their offer: ssh-rsa

In ~/.ssh/config add

    User admin
    PubkeyAcceptedAlgorithms +ssh-rsa
    HostkeyAlgorithms +ssh-rsa

Also there can be error:

Bad server host key: Invalid key length

That's because of key size

[root@pc .ssh]# grep RSAMinSize /etc/crypto-policies/back-ends/*
/etc/crypto-policies/back-ends/openssh.config:RSAMinSize 2048
/etc/crypto-policies/back-ends/opensshserver.config:RSAMinSize 2048

Try to make it smaller
Ви маєте увійти під своїм обліковим записом