title: How to login into a computing node within a `SGE` cluster using ssh terminal?
body: <p>I have the privilege to login into a submitting node in a <code>SGE</code> cluster. But I found I couldn't login into any computing node in the same <code>SGE</code> cluster. I have searched in <code>Google</code> and have been confirmed that in the network of computing nodes, it would have <code>ssh</code> right to connect between each two node of this network, then the job would run with the <code>MPI</code> environment. So why couldn't I connect anyone of the computing nodes using <code>ssh</code> terminal? When I tried to connect, the error message is <code>ssh_exchange_identification: Connection closed by remote host</code>. Is it because that the configuration have prevented the common user to do this operation?</p>