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While SSHing into my server with an RSA key, I get this message:
Address 255.100.236.105 1 maps to a1.example.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
Even though I get this error, I am still able to SSH into the machine.
I examined the DNS and figured out the issue. This server has lots of vhosts, so we have multiple A records for the same IP address.
A a1.example.com 255.100.236.105
A ssh.example.com 255.100.236.105
(there are a few more that point to the same IP)
I am trying to SSH to
ssh.example.com, and I am getting the above error. How do I get SSH to realize that the IP has multiple domain names that point to it?
NOTE: I can't ssh to
a1.example.com because that subdomain is going through CloudFlare's proxy.
UPDATE: I tested this on two computers. One gave me that error, one did not. Why would that be?
1 This is a fake IP, I made up. I'm not sure if it really points anywhere.