Проблемы и их решения

Проблемы с SSH

userauth_pubkey: signature algorithm ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]

/etc/ssh/sshd_config

PubkeyAuthentication yes
PubkeyAcceptedKeyTypes=+ssh-rsa

Или более изящно

echo 'PubkeyAcceptedKeyTypes=+ssh-rsa' >/etc/ssh/sshd_config.d/pubkey_rsa.conf
systemctl restart ssh

userauth_pubkey: signature algorithm ssh-dss not in PubkeyAcceptedAlgorithms [preauth]

Аналогично предыдущему

echo 'PubkeyAcceptedKeyTypes=+ssh-dss' >/etc/ssh/sshd_config.d/pubkey_dss.conf
systemctl restart ssh

ssh: sign_and_send_pubkey: signing failed: agent refused operation

нужно выполнить:

ssh-add

no matching key exchange method found. Their offer: diffie-hellman-group14-sha1

Сделать в файле ~/.ssh/config следующие строки

Host server_name server_ip
    KexAlgorithms +diffie-hellman-group14-sha1

no matching host key type found. Their offer: ssh-dss

Сделать в файле ~/.ssh/config следующие строки

Host server_name server_ip
    HostKeyAlgorithms +ssh-dss

ssh_dispatch_run_fatal: Connection to port 22: error in libcrypto

#update-crypto-policies --show
DEFAULT
#update-crypto-policies --set LEGACY
Setting system policy to LEGACY
Note: System-wide crypto policies are applied on application start-up.
It is recommended to restart the system for the change of policies
to fully take place.
#update-crypto-policies --show
LEGACY

update-crypto-policies --set DEFAULT:SHA1

linux, unix, проблемы