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A while ago I unsubscribed one domain name which I didn't use anymore, let's say abcd1234.com. It pointed to a server, and I used it to login to the server via SSH. I now use another domain name for this. A test via Network-tools shows that the domain is no longer active.

However - I just opened the terminal in Ubuntu, and accidentally typed in the old connection:

ssh [email protected]

It asked me for my password, and I entered it. Then the login was refused, and after one more try I realised the mistake. Now I'm wondering what is happening here. So I did a test and did the same with abcd1234xxx.com. Then the following message followed:

The authenticity of host 'abcd1234.com (0.0.0.0)' can't be established.

So either the domain name is known by the system, or it is active with SSH running. If I open the following file, I see hashes, no domain names, so there is nothing to search for.

/home/john/.ssh/known_hosts

What is happening here? Is this cache or how can you explain this? Can I remove these entries in the known hosts file?

I changed my password to be sure.

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    type the word alias at the terminal prompt. Did you set an alias to that address? If so edit your ~/.bash_profile or ~/.bashrc and remove the alias to the address.
    – Optichip
    Jan 20, 2015 at 11:59
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    Maybe there is still some local dns cache where he resolves the address.
    – Ivan Viktorovic
    Jan 20, 2015 at 12:53
  • I never set an alias for a domain name in bash. Maybe I would do that for a command, but not for a domain name. I did check and it didn't show anything. Still a good tip though. Local dns cache seems more logical.
    – SPRBRN
    Jan 20, 2015 at 13:09
  • How long ago did you remove the DNS it can take up to 72 hours for changes to propagate.
    – Jamin Quimby
    Jan 20, 2015 at 13:34
  • I didn't login with this machine for maybe a month. The domain name was unsubscribed more than a month ago.
    – SPRBRN
    Jan 20, 2015 at 13:41

1 Answer 1

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Hey did you get your DNS working again. Try this on command prompt to resolve unknown DNS issues: ipconfig /flushdns Good luck.

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