ssh scary warning!

I recently leased a second linode and redirected the ip address for a domain previously mapped to linode1 now to linode2. This new linode has 2 ip addresses. One is mapped to host.domain.tld, the other is mapped to domain.tld. I use zone edit to map the ip addresses to hostnames and have configured reverse dns on the linode accordingly.

when I execute

$ssh host.domain.tld

the connection is made and no errors are given

however, when I execute

$ssh domain.tld

the connection is made and I get the following output

'Address pdq.z.y.x maps to host.domain.tld, but this does not map back to the address - POSSIBLE BREAKIN ATTEMPT!'

any ideas on what I've done wrong? I've waited the requisite hour for dns to update but still see this error.

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Mark