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no ssh login to linux server possible - since rsa key alogrith isn't supported

problem: an old client cannot login to a ssh server anymore, the old client could be an Aruba Mobility wlan controler with an old firmware

solution: enable ssh-rsa temporary on your linux server, or leave it enabled it there are no security concerns

#add ssh-rsa to sshd_config file
/etc/ssh/sshd_config
HostKeyAlgorithms +ssh-rsa

#dont'f forget to restart the ssh service, so that the new configuration is activated
service sshd restart

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