Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

Hi I've got a problem trying to Rsync a backup to another server. I get the error

Address xxxxxxx maps to xxxxxxx, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

The first xxxxxxxxx is the correct IP but the second is a website and lord knows where that has come from is there any way around this problem?

I'm on a linux box in both accounts, just command line only.

share|improve this question

1 Answer 1

up vote 0 down vote accepted

reverse dns is fun. the "website" you mentioned is probably your ISPs reverse DNS record. usually something like blah.x.x.x.x.local.name.of.isp.tld or some such. You can hush that error up by adding an entry in the remote side's "hosts" (/etc/hosts) file by specifying an entry specifically for that IP... i.e.

x.x.x.x  my.example.com

For more info... here's a good article on that: http://www.electrictoolbox.com/reverse-mapping-possible-break-in-ssh/

share|improve this answer
    
Thanks for your help, I have to say thanks from the bottom of my heart! I've been talking to the 2 companies who are meant to help me sort these 2 servers out and none have helped - at last a straightforward answer! –  Richard Housham Jan 9 '12 at 10:41

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.