Today I was working on setting up public key authentication over SSH on few servers I inherited recently.  I have done this many times and never ran in to following error:

ssh_exchange_identification: Connection closed by remote host

After doing further research on the server I was trying to connect to (looking at logs) I noticed the server was denying connection based on ip.  I put my servers ip in /etc/hosts.allow and tried again.  This time I was connected without any problems.  Note that you do not have to restart SSH for hosts.allow change to take affect.

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DISCLAIMER: Please be smart and use code found on internet carefully. Make backups often. And yeah.. last but not least.. I am not responsible for any damage caused by this posting. Use at your own risk.

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