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ZFSSA 7420 appliance : unable to ssh/login via console

Is there way we can troubleshoot this error message while logging into ZFS7420  appliance ,tried both CLI and GUI login,it fails. Mounts works fine.

My guess is it requires reboot(TO/GB) to fix issue ...any ideas to solve this issue? Thanks in advance.

Error :

# ssh <hostname>

ssh_exchange_identification: Connection closed by remote host

Here is verbose o/p as well :

# ssh -vvv <hostname>

OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: Applying options for *

debug2: ssh_connect: needpriv 0

debug1: Connecting to <hostname> [XX.XX.XX.XX] port 22.

debug1: Connection established.

debug1: permanently_set_uid: 0/0

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

debug1: identity file /root/.ssh/identity-cert type -1

debug3: Not a RSA1 key file /root/.ssh/id_rsa.

debug2: key_type_from_name: unknown key type '-----BEGIN'

debug3: key_read: missing keytype

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug3: key_read: missing whitespace

debug2: key_type_from_name: unknown key type '-----END'

debug3: key_read: missing keytype

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

debug1: identity file /root/.ssh/id_rsa-cert type -1

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

debug1: identity file /root/.ssh/id_dsa-cert type -1

debug1: identity file /root/.ssh/id_ecdsa type -1

debug1: identity file /root/.ssh/id_ecdsa-cert type -1

ssh_exchange_identification: Connection closed by remote host