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Sshd doesn't care where the connection is coming from, if it's configured to do a reverse DNS lookup, it does.


If you cannot confirm that key fingerprint as coming from your ubuntu host, the likely cause is that you are not really connecting to the host/service that you think you are. Not only are you getting a different host key, the key length of 1040 seems a bit peculiar. Doing a quick google search on the fingerprint 86:03:d0:87:3d:67:3a:9a:9b:83:7a:39:a7:2e:e7:...


You can set the option UseDNS no in the file /etc/ssh/sshd_config on your server to tell sshd(8) not to do DNS lookups.

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