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I have server running Ubuntu 12.04.2 LTS (GNU/Linux 2.6.32-042stab078.28 i686)

Had no problem logging in to the server via ssh until my Internet Provider changed my IP. Now, the server keeps adding my IP to /etc/hosts.deny blacklist. Even when I delete it by hand and gives me ssh_exchange_identification: Connection closed by remote host.

As I login with root (not secure, I know...) I removed my pub key from /root/.ssh/known_hosts, but it didn't help, so clearly there are other security mechanisms which I'm not aware of.

Could somebody please give me some directions where I should look for the problem?

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Reset to default
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Take a look at /etc/hosts.allow, your old IP address should be listed there, modify the line with your new IP:

sshd: new.ip.add.ress

This security mechanism is called TCP Wrappers.

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  • Although old IP was not listed in hosts.allow adding the new one prevents system from adding my IP to blacklist. Thanks! Commented Dec 27, 2013 at 13:53

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