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Pilow's avatar
Icon for Nimbostratus rankNimbostratus
Jan 11, 2024

Add ssh-rsa to 17.1.1 host key algorithm



I've recently upgraded a HA pair of LTM devices to 17.1.1 and found out that I can no longer access the devices through 3rd party software SSH connection. I've been searching for the articles to resolve the issue but they only say I should upgrade the SSH connecting software or revise the settings of it which I can't since other network devices are connected as well.

I doubt this is because the OS versions later than 17.1.0 no longer support ssh-rsa.

Is there any way to add ssh-rsa to the device without changing anything on the 3rd party product?

  • Good find.

    Unfortunately, I do not think there is any alternative way. The only thing I can think of is possibly proxying the SSH client connection via a Jumphost server which supports the ssh-rsa host key algorithm.

    You may want to create a Support Case with F5 to see if they are able to provide any further suggestions.

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