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I'm trying to SSH in to one of my servers. Should the RSA fingerprint be the same no matter which of the server's IP addresses I use to connect, or will it be different for each?

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Unless you run multiple sshd instances... – andol Dec 17 '11 at 12:42
up vote 5 down vote accepted

It should always be the same, and it should match what is returned from ssh-keygen -lf /etc/ssh/ssh_host_rsa_key

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If you specify:

VisualHostkey yes

In your ssh client configuration (if you are using openssh client), you will see a graphical rendering of the fingerprint. This should make it easier/faster to compare visually then comparing a string of hex-digits.

But yeah, as stated before, the key/fingerprint is independant of the ip-adres or port-number. Though if you are hosting multiple ssh-installs (or using redirects on the network) you could see different fingerprints on the different ports.

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