Monthly Archives: August 2025

How to SSH to Older RHEL 6 hosts from modern RHEL 9 hosts

Final command line is: OPENSSL_CONF=~/.ssh/openssl.cnf ssh -o StrictHostKeyChecking=no -o ConnectTimeout=10 -o HostKeyAlgorithms=+ssh-rsa -o HostKeyAlgorithms=+ssh-dss -o PubkeyAcceptedAlgorithms=+ssh-dss -o PubkeyAcceptedAlgorithms=+ssh-rsa -o KexAlgorithms=+diffie-hellman-group-exchange-sha1 -o MACS=+hmac-sha1 -o PubkeyAcceptedKeyTypes=+ssh-rsa -o PubkeyAcceptedAlgorithms=+ssh-rsa $USER@$HOST Where ~/.ssh/openssl.cnf is: .include /etc/ssl/openssl.cnf[openssl_init]alg_section = evp_properties[evp_properties]rh-allow-sha1-signatures = yes

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