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Testing you SSH configuration
In order to take advantage of DenyHosts, you must ensure that your sshd server has been compiled w/ tcp_wrappers support. On most Linux distros, sshd has been compiled with tcp_wrappers enabled. If you are not sure, a simple test follows:
1. Login, as root, to your Linux system containing the sshd server.
2. Edit the file, /etc/hosts.deny
3. Add the following:
$ sshd: 127.0.0.1
4. Save the file
5. Attempt to connect to the local sshd server:
$ ssh localhost
6. You should see the following ssh error message:
ssh_exchange_identification: Connection closed by remote host
http://denyhosts.sourceforge.net/ssh_config.html
