https://bugzilla.redhat.com/show_bug.cgi?id=2064740

1. .ssh/config

Host rhel6-host
KexAlgorithms +diffie-hellman-group14-sha1
MACs +hmac-sha1
HostKeyAlgorithms +ssh-rsa
PubkeyAcceptedKeyTypes +ssh-rsa
PubkeyAcceptedAlgorithms +ssh-rsa

2./opt/openssl.cnf

.include /etc/ssl/openssl.cnf
[openssl_init]
alg_section = evp_properties
[evp_properties]
rh-allow-sha1-signatures = yes

3.ssh

OPENSSL_CONF=/opt/openssl.cnf ssh rhel6-host