SSH Puzzles

SSH Puzzles

Recently, when I tried to ssh to remote machine, it failed and reported the following error:

$ ssh -l $USER $REMOTE_MACHINE

ssh_exchange_identification: Connection closed by remote host


and I add -v parameter to print debugging messages about its progress.

$ ssh -v -l $USER $REMOTE_MACHINE

OpenSSH_5.1p1, OpenSSL 0.9.8i 15 Sep 2008

debug1: Connecting to $REMOTE_MACHINE port 22.

debug1: Connection established.

debug1: identity file ~/.ssh/identity type -1

debug1: identity file ~/.ssh/id_rsa type 1

debug1: identity file ~/.ssh/id_dsa type -1

debug1: ssh_exchange_identification:


debug1: ssh_exchange_identification:


debug1: ssh_exchange_identification: Error: Must authenticate before using this service.


ssh_exchange_identification: Connection closed by remote host


Then my colleague told me that I should pass the intranet firewall, and after I passed the firewall, ssh worked.

So stupid to forget passing firewall first.


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