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Full Discussion: SSH/Firewall issue
Operating Systems Solaris SSH/Firewall issue Post 302403740 by TonyLawrence on Sunday 14th of March 2010 10:22:17 AM
Old 03-14-2010
By the way, I really wouldn't advise enabling ssh for root unless absolutely necessary.

Better to ssh in as an ordinary user and su or sudo.

When testing for firewalls, a simple test for any protocol is to try

telnet sun2 (port)

which in this case is 22.

If nothing is blocking that, you'll see something like

Trying x,.x.x.x
Connected to sun2
Escape character is '^]'.
SSH-2.0-OpenSSH_4.3

(with that last line varying, of course)

If you don't get that, yes, you are looking at a firewall or routing issue. If you do get it, then ssh itself is refusing you and your next move is "ssh -v" to figure out why.

Note: Because ssh HAS -v, you don't really need the "telnet sun2 22" - the "ssh -v" would hang if it is blocked by a firewall or routing. It's just a good trick to keep in mind for any sort of access.
 

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LEARN ABOUT LINUX

ssh-argv0

SSH-ARGV0(1)						    BSD General Commands Manual 					      SSH-ARGV0(1)

NAME

     ssh-argv0 -- replaces the old ssh command-name as hostname handling

SYNOPSIS

     hostname | user@hostname [-l login_name] [command]

     hostname | user@hostname [-afgknqstvxACNTX1246] [-b bind_address] [-c cipher_spec] [-e escape_char] [-i identity_file] [-l login_name]
     [-m mac_spec] [-o option] [-p port] [-F configfile] [-L port:host:hostport] [-R port:host:hostport] [-D port] [command]

DESCRIPTION

     ssh-argv0 replaces the old ssh command-name as hostname handling.	If you link to this script with a hostname then executing the link is
     equivalent to having executed ssh with that hostname as an argument.  All other arguments are passed to ssh and will be processed normally.

OPTIONS

     See ssh(1).

FILES

     See ssh(1).

AUTHORS

     OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen.  Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
     Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH.  Markus Friedl contributed the support for SSH
     protocol versions 1.5 and 2.0.  Jonathan Amery wrote this ssh-argv0 script and the associated documentation.

SEE ALSO

     ssh(1)

Debian Project							 September 7, 2001						    Debian Project
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