RSA Keys No Longer Supported for SSH Access
As of LoadMaster firmware version 7.2.48.4 Long Term Support (LTS) and 7.2.53, RSA keys are no longer supported for SSH access to the LoadMaster. If you are using RSA keys for SSH access and you are upgrading to one of these versions (or above) you must move to another key type. There are two key types available as an alternative to the RSA keys:
ecdsa-sha2-nistp384
ssh-ed25519