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ssh-auth-methods doesn't support ssh-ed25519 #1556
Nmap 7.70 cannot retrieve authentication methods from a ssh server if the host does not support ssh-rsa nor ssh-dss.
Step to reproduce:
This feature can be implemented by upgrading libssh2 to 1.9 (not released yet). libssh2 1.8.1 has the implementation but not enabled by default (and iirc cannot be enabled without patching the source).